I have the following problem. Suppose I have 100 different variables named differently. Suppose a b c are three of the variables and I sort the data by a b and c. Because I appended several datasets, I want to check for duplicate values,ie count if a==a[_n-1] & b==b[_n-1] & c==c[_n-1] and so on. However if I have hundreds of other variables in the data set, is there a shorter way of asking Stata to check varX==varX[_n-1] rather than typing each individual variables separately, noting that the condition has to be checked against the same variable's lagged value? I am not sure the use of * is of help here. Can anyone help please?
Many thanks
Dev
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