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Predicting effects of water pH and TDS on electrical conductivity (dS/m).

Test: Standard Least Square Regression Model (SLSRM)

Response EC (dS/m)

Effect Summary

Source LogWorth PValue

pH 2.187 0.00649

TDS (ppm) 1.353 0.04441

Actual by Predicted Plot

Summary of Fit

RSquare 0.182876

RSquare Adj 0.156936

Root Mean Square Error 0.004177

Mean of Response 0.018879

Observations (or Sum Wgts) 66

Analysis of Variance

Source DF Sum of

Squares

Mean Square F Ratio

Model 2 0.00024597 0.000123 7.0499

Error 63 0.00109906 0.000017 Prob > F

C. Total 65 0.00134503 0.0017*

Parameter Estimates

Term Estimate Std Error t Ratio Prob>|t|

Intercept -0.00126 0.005904 -0.21 0.8317

pH 0.002775 0.000986 2.82 0.0065*

TDS (ppm) 0.0003162 0.000154 2.05 0.0444*

Residual by Predicted Plot

Sorted Parameter Estimates

Term Estimate Std Error t Ratio Prob>|t|

pH 0.002775 0.000986 2.82 0.0065*

TDS (ppm) 0.0003162 0.000154 2.05 0.0444*

Prediction Expression

Prediction Profiler

Contour Profiler

Predicting effects of water EC (dS/m) and TDS (ppm).

Test: Standard Least Square Regression Model (SLSRM)

Response TDS (ppm)

Effect Summary

Source LogWorth PValue

EC (dS/m) 1.671 0.02133

Regression Plot

Actual by Predicted Plot

Summary of Fit

RSquare 0.080066

RSquare Adj 0.065692

Root Mean Square Error 3.282833

Mean of Response 11.39394

Observations (or Sum Wgts) 66

Analysis of Variance

Source DF Sum of

Squares

Mean Square F Ratio

Model 1 60.02994 60.0299 5.5702

Error 64 689.72764 10.7770 Prob > F

C. Total 65 749.75758 0.0213*

Parameter Estimates

Term Estimate Std Error t Ratio Prob>|t|

Intercept 7.4056009 1.737526 4.26 <.0001*

EC (dS/m) 211.26031 89.51232 2.36 0.0213*

Residual by Predicted Plot

Sorted Parameter Estimates

Term Estimate Std Error t Ratio Prob>|t|

EC (dS/m) 211.26031 89.51232 2.36 0.0213*

Prediction Expression

Prediction Profiler

Box-Cox Transformations

Predicting effects of temperature (F) and EC (dS/m) on water pH.

Test: Standard Least Square Regression Model (SLSRM)

Response pH

Whole Model

Effect Summary

Source LogWorth PValue

Temp (F) 5.951 0.00000

EC (dS/m) 2.970 0.00107

Actual by Predicted Plot

Summary of Fit

RSquare 0.403444

RSquare Adj 0.384506

Root Mean Square Error 0.416745

Mean of Response 5.958788

Observations (or Sum Wgts) 66

Analysis of Variance

Source DF Sum of

Squares

Mean Square F Ratio

Model 2 7.399697 3.69985 21.3031

Error 63 10.941606 0.17368 Prob > F

C. Total 65 18.341303 <.0001*

Parameter Estimates

Term Estimate Std Error t Ratio Prob>|t|

Intercept -0.724998 1.115471 -0.65 0.5181

Temp (F) 0.0693052 0.012857 5.39 <.0001*

EC (dS/m) 39.008074 11.37533 3.43 0.0011*

Residual by Predicted Plot

Prediction Expression

EC (dS/m) Leverage Plot Temp (F) Leverage Plot

Prediction Profiler

Contour Profiler

Response Evapotranspiration (mm/d)

Regression Plot

Actual by Predicted Plot

Summary of Fit

RSquare 0.999999

RSquare Adj 0.999999

Root Mean Square Error 0.003003

Mean of Response 9.050143

Observations (or Sum Wgts) 70

Analysis of Variance

Source DF Sum of

Squares

Mean Square F Ratio

Model 1 1041.5223 1041.52 1.155e+8

Error 68 0.00061342 9.021e-6 Prob > F

C. Total 69 1041.5229 <.0001*

Lack Of Fit

Source DF Sum of

Squares

Mean Square F Ratio

Lack Of Fit 6 0.00061342 0.000102 .

Pure Error 62 0.00000000 0.000000 Prob > F

Total Error 68 0.00061342 .

Max RSq

1.0000

Parameter Estimates

Term Estimate Std Error t Ratio Prob>|t|

Intercept 0.0013483 0.000915 1.47 0.1454

Evaporation (mm/d) 0.9500047 8.841e-5 10745 <.0001*

Residual by Predicted Plot

Sorted Parameter Estimates

Term Estimate Std Error t Ratio Prob>|t|

Evaporation (mm/d) 0.9500047 8.841e-5 10745 <.0001*

Prediction Expression

Prediction Profiler