# Rahim ChinipardazShahid Chamran University of Ahvaz | scu · Department of Statistics

Rahim Chinipardaz

PhD

## About

94

Publications

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334

Citations

Citations since 2017

## Publications

Publications (94)

This paper introduces a new family of multimodal and skew-symmetric circular distributions, namely, the sine-cosine weighted circular distribution. The fundamental properties of this family are examined in the context of a general case and three specific examples. Additionally, general solutions for estimating the parameters of any sine-cosine weig...

COVID-19 disease has aggressively affected all aspects of human life since late 2019. Hospital staff have been under unprecedented pressure from a large number of patients, and in some countries, the lack of space for patients at the height of the epidemic has reached a point where hospitals do not have the capacity to accept new patients. Therefor...

This article deals with stochastic comparisons of series systems comprising a new modified generalized linear failure rate family of distributions. The results are established in three directions. First, we establish based on vector majorization the usual stochastic order and the hazard rate order of series systems. Next, multiple-outlier models ar...

Background
Appearance of improper immune responses against the fetus and/or inadequate immunoregulatory mechanisms during pregnancy may lead to recurrent spontaneous abortion (RSA). TH17 cells play a significant role in inducing inflammation, autoimmune disease, and acute transplant rejection, while regulatory T (Treg) cells moderate the function o...

Area-of-Interest (AOI) recommendation is a type of context-aware recommendation that works based on location-based data. A context-aware recommender system should be able to provide the recommendations to the users based on their request time. Often, existing context-aware systems assume that the context information is constant over time and ignore...

Weighted sampling is a useful method for constructing flexible models and analyzing data sets. In this paper, a new weighted distribution of skew normal is introduced with four parameters. The proposed model is a generalized version of several distributions, such as normal, bimodal normal, skew normal and skew bimodal normal-normal. This weighted m...

Introduction: Dyslipidemia is one of the major risk factors for atherosclerosis and the main cause of death in the developing and developed countries. In this cohort study, the incidence of dyslipidemia and its components have been studied among individuals over 20 years old in Ahvaz, southwest of Iran. Materials and methods: The Phase 1 of this st...

The interval null hypothesis is considered against the two-sided hypothesis. It was shown that p-value in interval null hypothesis can be numerically approximated by p-value of point null when interval converges to a single point of hypothesis. However, it is not true for Bayes factor or posterior probability. When the null hypothesis is substitute...

Gamma-ray bursts (GRBs) have been confidently identified thus far and are prescribed to different physical scenarios, black hole mergers, and collapse of massive stars. The distribution of GRBs duration, which is one of the main characteristics of GRBs, is bimodal. Hence, many authors have used mixtures of distribution models to fit them, which suf...

This article draws a comparison between the Bayesian measure (the posterior probability) and the frequentist measure (the p-value) in testing point null hypothesis for mean vector of the multivariate normal distribution in the presence of an unknown covariance matrix. Firstly, by applying a fxed prior for test parameter, the posterior probability i...

در این مقاله آزمون دوطرفه برای پارامتر واریانس توزیع نرمال − با میانگین معلوم− به شیوه بیزی و معنی
داری با هم مقایسه می شوند. در آزمون دوطرفه ابتدا تحت یک توزیع پیشین، معیار بیزی ) احتمال پسین فرض صفر(
با معیار معنی داری ) مقدار احتمال( مقایسه می شود.همچنین بزرگترین کران پایین احتمال پسین فرض صفر تحت
خانواده ای از توزیع های پیشین با مقدار احتمال مق...

Personalized travel package recommendation for tourists is an important task in the e-Tourism field. With the excessive growth of data over the internet, it has become difficult to find relevant information among all of the Points-of-Interest (PoIs) for tourists. Recommendation Systems (RSs) are the essential tools to tackle the information overloa...

In this article, we first introduce a procedure for the construction of a general family of symmetric distributions. Then, using Azzalini’s approach, we build a rich family of asymmetric distributions. Next, we focus our attention on a specific case of this general class of asymmetric distributions, which subsumes and extends several well-known uni...

By the advent of some applications in the web 2.0 such as social networks which allow the users to share media, many opportunities have been provided for the tourists to recognize and visit attractive and unfamiliar Areas-of-Interest (AOIs). However, finding the appropriate areas based on user’s preferences is very difficult due to some issues such...

Genotype × environment interactions complicate selection of superior genotypes for narrow and wide adaptation. Multi-environment yield trials of twenty durum wheat genotypes were conducted at five locations of Iran (Gachsaran, Gonbad, Moghan, Ilam and Khorram abad) over four years (2009-2013). Combined ANOVA of yield data of the twenty environments...

Publisher
SHAHID CHAMRAN UNIVERSITY JOURNAL OF SCIENCE
Description
Monosialoganglioside GMI has been found to be abundant in various regions of the mammalian central nervous system. Numerous investigations have indicated the involvement of ganglioside in neurobiological events associated with adaptive with adaptive functions, neuronal plasticity an...

Abstract:
In this study the effect of cholestrol and lovastation on spatial learning task, was investigated by using T-maze in male N-MARI rats. The animals were divided into four groups; the first group were fed with diets containing %5 cholesterol at libitum for 7 days, and second group were fed with Lovastation (30mg/kg/day) for 9 days after ad...

Extensive evidence strongly suggest that modest increases in circulating glucose modulate learning and memory processes, but researches on elucidating the physiological basis of this action are still continuing. In the present study, we investigated the effect of glucose on amnesia induced by the non-competitive NMDA antagonist, Mk-80l in rats. AY-...

Volume 6 Issue 354 Pages 343-351 Publisher JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL Description Objective: Oleic acid (OA)(Omega 9) is an essential constituent of neuronal membrane. This fatty acid is transferred across the placenta and is accumulated in the brain during fetal development. It induces neuronal differentiation during rat brain developm...

Journal KOREAN JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY Volume 10 Pages P Publisher THE KOREAN PHYSIOLOGICAL SOCIETY & THE KOREAN Description Objective: Oleic acid (OA)(Omega 9) is an essential constituent of neuronal membrane. This fatty acid is transferred across the placenta and is accumulated in the brain during fetal development. It induces neur...

Volume 14 Issue 12 Pages 22-31 Publisher IRANIAN JOURNAL OF BIOLOGY Description In this study, the effects of sesame oil on spatial learning have been investigated. Male rats were trained for a spatial learning task using T-Maze. The rats divided into four groups and 8 rats were considered for each group. The first group, control group wad fed with...

Issue 29 Pages 26-34 Publisher JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL Description In this study, the effects of corn oil on spatial learning have been investigated. Male rats were trained for a spatial learning task using T-Maze. The rats were divided into four groups and 9 rat were considered for each group. The first group, control group was fed...

The weighted distributions are used when the sampling mechanism records observations according to a nonnegative weight function. Sometimes the form of the weighted distribution is the same as the original distribution except possibly for a change in the parameters that is called the form-invariant weighted distribution. In this paper, by identifyin...

This article proposes a development of detecting patches of additive outliers in autoregressive time series models. The procedure improves the existing detection methods via Gibbs sampling. We combine the Bayesian method and the Kalman smoother to present some candidate models of outlier patches and the best model with the minimum Bayesian informat...

The quadratic form of non-central normal variables is presented based on a sum of weighted independent non-central chi-square variables. This presentation provides moments of quadratic form. The maximum entropy method is used to estimate the density function because distribution moments of quadratic forms are known. A Euclidean distance is proposed...

Purpose: the purpose of the present study is to investigate and analyze papers and theses adopted in field of knowledge and information science to assess research subjects in this field to achieve research priorities.
Method: this study has been adopted using review and library methods. Totally, 77 papers and 15 theses have been reviewed and analyz...

Purpose: The Purpose of this study is identification and categories important research topics in knowledge and information science and measurement of their importance to determine research priorities in the field.
Method: This study is of an applied-theoretical type that done by documentary analytic and survey method. The study population consisted...

In this paper, a novel method for copula density estimation using Legendre multiwavelet is proposed. In general, copula density estimation methods based on the multiwavelet benefit from some useful properties, including they are symmetric, orthogonal and have compact support. In particular, the Legendre multiwavelet as a more general and vector-val...

In this paper, the comparison between the Fisher information on parameters of the weighted distributions and the parent distributions is done. The most common family of distributions, location-scale family, is considered with the exponential weight function w(x) = eβx where β is a constant. Conditions under which the weighted distributions are more...

Introduction:
Dyslipidemia is one of the major risk factors for atherosclerosis and the main cause of death in the developing and developed countries. In this cohort study, the incidence of dyslipidemia and its components have been studied among individuals over 20 years old in Ahvaz, southwest of Iran.
Materials and methods:
The Phase 1 of this...

We introduce an extension of the skew generalized normal distribution called shape-skew generalized normal distribution. The proposed distribution has certain type of flexibility which is different from those given in other flexible skew normal distributions. It possesses properties such as uni/bimodality, skewness, wider range of the Pearson’s exc...

This article is concerned with the comparison P-value and Bayesian measure for the variance of Normal distribution with mean as nuisance paramete. Firstly, the P-value of null hypothesis is compared with the posterior probability when we used a fixed prior distribution and the sample size increases. In second stage the P-value is compared with the...

This paper is concerned with the outliers in GARCH models. An iterative procedure is given for testing the presence of any type of the four common outliers. Since the distribution of test statistic can not be obtained analytically, its distributional behavior is investigated via a simulation study.The simulation study is based on estimation of resi...

The skew normal distribution of Azzalini (Scand J Stat 12:171–178, 1985) has been found suitable for unimodal density but with some skewness present. Through this article, we introduce a flexible extension of the Azzalini (Scand J Stat 12:171–178, 1985) skew normal distribution based on a symmetric component normal distribution (Gui et al. in J Sta...

The allocation of resources in the health authority areas is based on a mapping of disease incidence
and determination distribution of disease relative risk in small areas. Data on tuberculosis (TB) have been
analyzed before, without giving sufficient attention to spatial variations. We aim to find high risk cities of
Khuzestan province for TB with...

Selection of durum wheat genotypes with wide adaptability across various environments is important before recommending them to reach a high rate of genotype adoption. Multi-environment grain yield trials of 20 durum wheat genotypes were conducted at five locations of Iran (Gachsaran, Gonbad, Moghan, Ilam and Khorram abad) over four years (2009-2013...

In this paper, a general framework of mixture time series is introduced as General Mixture of Linear Autoregressive. This framework contains well known mixture time series such as Mixture Autoregressive, Local Linear Global Neural Network and Logistic Mixture Autoregressive models. The sufficient conditions for geometric ergodicity of such model ar...

This article is concerned with the comparison of P-value and Bayesian measure in point null hypothesis for the variance of Normal distribution with unknown mean. First, using fixed prior for test parameter, the posterior probability is obtained and compared with the P-value when an appropriate prior is used for the mean parameter. In the second, lo...

Background: There is a strong relationship between physical inactivity and low-grade inflammation and its adverse health outcomes, particularly cardiovascular disease. The level of anti-inflammatory and pro-inflammatory cytokines may be changed by exercise.
Objectives: The aim of the present study was to determine the response of certain inflammat...

This article is concerned with the problem of discrimination between two classes of locally stationary time series based on minimum discrimination information. We view the observed signals as realizations of Gaussian locally stationary wavelet (LSW) processes. The asymptotic Kullback - Leibler discrimination information and Chernoff discrimination...

This paper is concerned with the comparison of Bayesian and classical testing of a point null hypothesis for the Pareto distribution when there is a nuisance parameter. In the first stage, using a fixed prior distribution, the posterior probability is obtained and compared with the P-value. In the second case, lower bounds of the posterior probabil...

This article is concerned with the development of discrimination procedure for seismic data based on feature extraction. These features are the maximum and minimum (maximin) values of Nondecimated Wavelets Transform (NDWT), which were extracted from the P component of the original earthquake and explosion traces. The method provides small error rat...

The quadratic discriminant function (QDF) with known parameters has been represented in terms of a weighted sum of independent noncentral chi-square variables. To approximate the density function of the QDF as m-dimensional exponential family, its moments in each order have been calculated. This is done using the recursive formula for the moments v...

This paper is concerned with the outliers in GARCH models. An iterative
procedure
has been given for testing the presence of any type of the four common outliers.
Since the distribution of test statistic can not be obtained
analytically, its distributional behavior has been investigated
via a simulation study.
The simulation study is based on estim...

Sickle cell disease is an autosomal recessive disorder that appears as a serious chronic hemolytic anemia. Vaso-occlusive crisis is the most important cause of morbidity and mortality in these patients. Recent findings showed that the expression of leukocyte adhesion molecules on vascular endothelium increased the risk of vaso-occlusive crisis in t...

Consider the problem of testing the isotonic of several p-variate normal mean vectors against all alternatives. It is difficult to compute the exact p-value for this problem of testing with the classical method when the covariance matrices are completely unknown. In the present paper, a test statistic is proposed for this problem of testing. A refo...

In this article, we have discussed about long-memory of processes of time series at Polchehr, Polkohne and Heydarabad hydrometric stations of Gamasiab River at Kermanshah by using daily, monthly and seasonal (1/4-year) discharge average data through heuristic, semi-parametric and parametric methods. Also, we have discussed about existence of long-m...

Introduction: Estrogen is one of the gonadal hormones that has multiple beneficial actions in central nervous system and involves in learning and memory. Alzheimer's disease (AD) is a progressive neurodegenerative disorder that impairs patient memory. The human nucleus basalis of Meynert (nBM) is severely affected in Alzheimer's disease. So in this...

In applied statistics, there are many situations in which data does not satisfy a unimodal distribution. For example, the distribution of uncontrolled data in quality control or outlier observations in linear models and time series may require to be considered as bimodal. Such situations occur, when the recorded data have a probability proportional...

The problem of discrimination between two stationary AR(p) plus noise processes is considered when the noise process are different in two models. The discrimination rule leads to a quadratic form with cumbersome matrices. An approximate and analytic form is given to distribution of the discriminant. The simulation study has been used to show the pe...

In this paper, form-invariant weighted distributions are considered in an exponential family. The class of bivariate distribution with invariant property is identified under exponential weight function. The class includes some of the custom bivariate models. The form-invariant multivariate normal distributions are obtained under a quadratic weight...

Alzheimer' disease (ad) is a neurodegenerative disorder that destroyed patient memory, communication ability with the social environment and the ability to carry out daily activities. The human nucleus basalis of meynert (nbm) severely affected in Alzheimer. The cholinergic hypothesis of Alzheimer's has led to a number of animal models to study in...

This study is devoted to compare the goodness of fitting of the monthly precipitation for five old raingauge stations (Bushehr, Isfahan, Meshed, Tehran and Jask) in Iran using parametric and nonparametric methods. The parametric methods include normal, two and three parameter log-normal, two parameter gamma, Pearson and log-Pearson type III and Gum...

To study the relationship between aluminum chloride (AlCl<sub>3</sub>) and memory of their offspring male. Five groups of adult Wistar rats (200 Ã‚Â± 30) were taken for this experiment. Female rats were concurrently exposed (0, 200, 400, 600 and 800 mg/kg/day) of aluminum administered as AlCl<sub>3 </sub>in drinking water for two weeks. Forty-five...

Testing of point null hypothesis on the mean vector of a multivariate normal distribution is studied. Of interest is relationship between p-value (or observed significance level) and Bayesian measure of evidence against the null hypothesis, expressed in terms of the infimum of the posterior probability of the null hypothesis. When the dimension of...

The aim of the present study is for evaluating the effect of different doses of palmitic acid on spatial learning in T-maze. So, Wister adult male rats were used in five groups and considered 10 rats for each group. The first group as a control group was fed with ordinary diet. Four groups were fed with a diet containing palmitic acid (10%) for 1,...

This article is concerned with the problem of independence in weighted distributions. The dependence structure in bivariate weighted distributions has been discussed. It has been shown that when the weight function does not factor to the separated functions the dependence structure of weighted random variables is related to the form of weight funct...

Recent attention has focused on the expression of integrin molecules within the endometrium, and their relation to infertility.
The present prospective study was undertaken to determine whether the endometrium of women with unexplained infertility differs in the expression of very late activation antigens (VLA) from the endometrium of normal fertil...

The problem of discrimination between two autoregressive processes of order p is considered when the observed time series is contaminated with an extra noise and the main discriminatory information is in the covariance structure rather than the mean. An analytic discrimination rule is given based on likelihood ratio and its performance is examined....

Analysis of time series data can involve the inversion of large covariance matrices. For the class of ARMA(p,q) processes there are no exact explicit expressions for these inverses, except for the MA(1) process. In practice, the simple covariance matrix can be very large and inversion can be computationally time consuming and so approximate explici...

A normality assumption is usually made for the discrimination between two stationary time series processes. A nonparametric approach is desirable whenever there is doubt concerning the validity of this normality assumption. In this paper a nonparametric approach is suggested based on kernel density estimation firstly on (p+1) sample autocorrelation...

The problem of discrimination between two time series processes is considered for real life data. It is shown that the discrimination can be made with some autocovariances. This method and the method based on fitting are used in seismic data generated by earthquakes and explosions recorded in Scandinavia. The linear and quadratic approaches have be...

The problem of testing a point null hypothesis in Poisson distribution is considered. The Bayesian measure of evidence against the null hypothesis is compared with P-value (or observed significance level). Lindley and Jeffreys approach is folowed for Poisson distribution. Bayesian measure of evidence against the null hypothesis expressed in terms o...

The problems of testing a one-sided hypothesis and a point null hypothesis versus a one sided hypothesis in nonregular distributions are considered. P-values (or observed significance levels) and posterior probabilities of H 0 are obtained and it is shown that there is a prior distribution (proper or improper) under which the P-value and the Bayesi...

Spontaneous abortion is the most common complication of pregnancy. Several lines of evidence indicate that immunologic effector cells may play a role in the pathogenesis of idiopathic repetitive abortions. Leukocytes form a substantial proportion of stromal cells in decidua and the endometrial granulated lymphocytes (eGL) is the predominant decidua...

The problem of diagonalization of the autocovariance matrices of stationary processes is discussed. Basically, there is no explicit form for the diagonal matrices. An analytic solution has been provided for stationary ARMA models based on band matrices. The results have been compared with those of G. R. Dargahi-Noubary [Commun. Stat., Theory Method...

Cholesterol is an essential constituent of neuronal membrane. It is a lipid-like substance that is present in animal diets, and foodstuffs like butter contains large amounts of cholesterol and saturated fatty acids. Therefore, it is predicted that dietary butter affects structure and function of neurons. In this study the effect of butter (as an an...

This paper is concerned with the discrimination between two stationary AR(1) plus noise processes in the time domain approach. The distribution of the discriminant function, when the differences between two stationary processes is concentrated in their variances rather than their means, leads to a linear combination of one degree of freedom chi-squ...

The problem of discrimination between two stationary ARMA time series models is considered, and in particular AR(p), MA(p), ARMA(1,1) models. The discriminant based on the likelihood ration leads to a quadratic form that is generally too complicated to evaluated explicitly. The discriminant can be expressed approximately as a linear combination of...

Publication date
1989
Journal
Pakistan Journal of Biological Sciences
Volume
10
Issue
16
Pages
231-242
Publisher
orgz
Description
The aim of the present study is for evaluating the effect of different doses of palmitic acid on spatial learning in T-maze. So, Wister adult male rats were used in five groups and considered 10 rats for each group. The...

Discrimination of time series data can be carried out either in the frequency domain or in the time domain. Applications have been found useful in certain areas such as seismology and medicine. To date most discriminative work has been carried out for linear and stationary time series models. This paper extends the theory by considering the discrim...