NOBS number of observations in the data set. NPOS physical position of the first character of the variable in the data set. A indicates the data set is alter-protected. R indicates the data set is read-protected. W indicates the data set is write-protected.
Possible values are .
1 for sorted and validated. Possible values are . A negative value of n indicates that the data set is sorted by the descending order of that variable. Variables are numbered in the order they appear. The Data Set Health.