Keywords: class

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### Index Variables

The variable `FOUND` refers to the number of observations in the index. It is declared Read-Only of course. Its main use is either to write a SIC loop that goes through the index or to test for actions which should be performed only if something exists in the index. The `FIND` command does not return an error, but set `FOUND = 0`, if it finds nothing. A second variable related to the index is the `INDEX` array, of dimension `FOUND`, which contains the observation numbers of all observations in the index.