GLUE Results

Generalized Likelihood Uncertainty Estimation

GLUE Results

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The main results that users will be interested in can be seen by selecting the “View Cultivar Coefficient” button (Figure 10). This will open an editor with the final values of the estimated coefficients in it. The format of the file is the same as the CUL file for the selected crop, so one can copy this new set of cultivar coefficients into the appropriate CUL file to use in additional simulations. Note that one should use the DSSAT feature to “Update all Lists” after adding a new cultivar to any CUL file.

 

All of the outputs of DSSAT and GLUE running are saved in the “C:\DSSAT45\GLWork\” directory. The contents of main output files are briefly described as follows:

 

(a)Optimal Parameters. The optimal parameter set that was chosen through GLUE procedure was saved as a “CUL” file named according to the name and ID of the selected cultivar when generating the batch file. For example, if the selected cultivar was soybean “COBB”, then the “CUL” file is “SBIB0002 COBB.CUL” (Table 1 in Appendix E).
(b)Statistics of Posterior Distributions (Mean, Standard Deviation, and Maximum Likelihood Values). The two files identified as “PosteriorDistribution_1.txt” and “PosteriorDistribution_2.txt” (Table 2 and 3 in Appendix E) store the posterior distributions for each round of GLUE, including the mean values, standard deviations, and the parameter set that has the highest likelihood value in that round of GLUE.
(c)Empirical Distribution of Parameter Tables. The two files identified as “RandomParameterSetsAndProbability_1.txt” and “RandomParameterSetsAnd

Probability_2.txt” (Table 4 and 5, Appendix E) store the really used parameter sets and their corresponding probability or normalized likelihood values for each round of GLUE.

(d)Generated Parameter Sets. The two files identified as “RealRandomSets_1.txt” and “RealRandomSets_2.txt” store the really used parameter set in each round of GLUE.
(e)Last Model Run Results. “Evaluate_output.txt” stores the content of output file “Evaluate.OUT” of DSSAT for each model run. Since the “Evaluate_output.txt” is processed after each model run, only the result of last model run will be available in the “Evaluate_output.txt” file after the GLUE procedure. This file is not needed for result analysis, but it is described here because it will be in the directory and model users should ignore it.
(f)Results for Computing Likelihood Values. The two files “EvaluateFrame_1.txt” and “EvaluateFrame_2.txt” store the appended data of the processed “Evaluate_output.txt” files for the two rounds of GLUE. In each file, the simulated and measured outputs are saved for each treatment and each model run.
(g)Combined Likelihood Value for Each Parameter Set. The two files identified as “IntegratedLikelihoodMatrix_Frame_1.txt”, and “IntegratedLikelihoodMatrix_Frame_2.txt” (not shown) store the combined likelihood values for all treatments in each model run or for reach parameter set. For example, in the file “IntegratedLikelihoodMatrix_Frame_1.txt”, it stores the combined likelihood values for observations “ADAP”, “MDAP”, and “PD1P” for the first round GLUE. In “IntegratedLikelihoodMatrix_Frame_2.txt”, it stores the combined likelihood values for observations “PWAM”, “HWAM”, “CWAM”, “LAIX”, and “L#SM” for the second round GLUE. When the combined likelihood value is “1” in one column, it means the observation is absent.
(h)Combined Likelihood Value for Each Experiment Treatment. If there are only two treatments in the experiment for GLUE procedure, then the following files, “IntegratedLikelihoodTreatment_1_1.txt”, “IntegratedLikelihoodTreatment_1_2.txt”, “IntegratedLikelihoodTreatment_2_1.txt”, and “IntegratedLikelihoodTreatment_2_2.txt”, respectively, store the combined likelihood values for each treatment in each round of GLUE. The “IntegratedLikelihoodTreatment_1_1.txt” file, for example, stores the combined likelihood value for GLUE 1 and treatment 1 for all generated parameter sets, so do other files. One can see these files in the DSSAT45/GLWork directory after any GLUE estimation procedure is run.