S. DebRoy’s scientific contributions

... For data analyses with Welch's t-test and Pearson Chi-square, the SPSS statistical package version 26 was used. The regression models were fitted using the 'nlme' package version 3.1-153 [26] in R version 4.1.1 [27]. ...

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Long-term follow-up of self-reported mental health and health-related quality of life in adults born extremely preterm

... The assumptions of homoscedasticity and residual normality were checked (Quinn and Keough 2002), and, when not met even after data transformations, the function "varIdent" was applied (Zuur et al. 2009). The mixed models were conducted with the package "nlme" (Pinheiro et al. 2012) implemented in the software R (R Development Core Team 2012). In all cases, backward stepwise selection was applied. ...

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Increased Temperature and Exposure to Ammonium Alter the Life Cycle of an Anuran Species

... We determined the optimal models in terms of fixed effects based on an evaluation of the t-statistics associated with model parameters and likelihood ratio tests (Zuur et al., 2009). The lme function in the nlme package (Pinheiro et al., 2014) in R (R Development Core Team, 2020) was used to fit the models. ...

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Change in soil carbon, nitrogen, and phosphorus after timber harvesting in northern hardwood forests

... Three different gamma location scale generalized linear models (GLMs) were constructed using the nlme package (v3.1-162) [48] to visualize trends in both the mean and variance in α for pairings made by each cover crop and the overall trend of all pairs: α as a function of the summed occurrences for each cover crop in a pair with no random effects, added random effects for cover crop, and added random effects for cover crop using the summed occurrences as the intercepts. The support for these models was then evaluated via AIC. ...

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The Relationship Between Cover Crop Species and Soil Fungal Communities in Irrigated Vineyards in the Okanagan Valley, Canada