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2013 Apr 30
0
Fastbw() function: grouping of variables
...le with multiple levels. Examples: fit1 <-lrm(outcome~age + gender + med_a + med_b + med_a:med_b, x = TRUE, y = TRUE, data = example) fastbw(fit1, type = "residual). --> fastbw may drop med_a and keep the med_a:med_b interaction instead. fit2 <-lrm(outcome~age + gender + comorb_a + comorb_b + comorb_c + other predictors, x = TRUE, y = TRUE, data = example) fastbw(fit2, type = "residual). --> fastbw may drop some of the comorbidities, but I would like to consider them as one group. Any help is much appreciated! Maaike -------------------------------------------------------...