Prints Cross-wave transition matrix and returns the vector behind the matrix. Missing values are treated as ignorance. Don't know responses need to be coded as 'd'.
transmat(pre_test_var, pst_test_var, subgroup = NULL, force9 = FALSE)
| pre_test_var | Required. A vector carrying pre-test scores of a particular item. Only |
|---|---|
| pst_test_var | Required. A vector carrying post-test scores of a particular item |
| subgroup | Optional. A Boolean vector indicating rows of the relevant subset. |
| force9 | Optional. There are cases where DK data doesn't have DK. But we need the entire matrix. By default it is FALSE. |
a numeric vector. Assume 1 denotes correct answer, 0 and NA incorrect, and d 'don't know.' When there is no don't know option and no missing, the entries are: x00, x10, x01, x11 When there is a don't know option, the entries of the vector are: x00, x10, xd0, x01, x11, xd1, xd0, x1d, xdd
pre_test_var <- c(1,0,0,1,0,1,0) pst_test_var <- c(1,0,1,1,0,1,1) transmat(pre_test_var, pst_test_var) # With NAs pre_test_var <- c(1,0,0,1,"d","d",0,1,NA) pst_test_var <- c(1,NA,1,"d",1,0,1,1,"d") transmat(pre_test_var, pst_test_var)