Fix arg type for expr_parse.
[pspp] / tests / stats /
drwxr-xr-x   ..
-rwxr-xr-x 4607 descript-basic.sh
-rwxr-xr-x 1115 descript-mean-bug.sh
-rwxr-xr-x 5259 descript-missing.sh
-rwxr-xr-x 2594 moments.sh
-rwxr-xr-x 1423 ntiles.sh
-rwxr-xr-x 2102 percentiles-compatible.sh
-rwxr-xr-x 6840 percentiles-enhanced.sh