: Used to test if the model is correctly specified; values near 1.0 generally indicate a good fit. : A criterion where "smaller is better," often used to compare the performance of different models. Residual Analysis
Specifying the Likelihood Function: This function represents the probability of observing the given data, given the model parameters (the coefficients).
Unlike population studies which look at unrelated individuals, much of genetic research relies on families (pedigrees). Analyzing family data is mathematically tricky because the data points are not independent—a child’s genes are a direct mix of their parents'. Genmod specializes in checking and cleaning pedigree data. It automatically detects Mendelian errors (situations where a child has a genetic variant that biologically could not have come from their parents) and prepares the data for linkage analysis.
Statisticians use GENMOD to handle specific data types: