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Caution: In a column with the List Check property, you can enter only a value that is in the list. Otherwise, JMP warns that the cell contains invalid data when you try to enter the new value. For details, see List Check.
To compress columns, select one or more columns and select Cols > Utilities > Compress Selected Columns. (Select all columns if you do not know which columns can be compressed.)
The column or columns are compressed if possible. The log shows which columns were compressed and how they were compressed. (Select View > Log to show the log.)
Note: To compress a numeric column manually, set your Tables preferences to allow short numeric data and then change the column’s data type to 1-byte integer, 2-byte integer, or 4-byte integer. For details about this preference, see Tables in JMP Preferences.