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Selection among statistical models describing the same process is a crucial methodological step in quantitative research. Because different estimators for the same process are commonly available, researchers have developed tests for selecting among models. The R package mode LLtest implements a variety of such tests using leave-one-out cross-validation (LOOCV) to adjudicate among estimation methods. LOOCV accounts for outliers in data by comparing results across samples in which one observation has been left out (Diebold & Mariano, 2002).

modeLLtest: An R Package for Unbiased Model Comparison using Cross Validation