Using JMP - SAS

164 Set Column Properties Chapter 5
Compress Selected Columns
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
about list checking, see “List Check” on page 153.
Figure 5.6 List Check Property Added to a Compressed Character Column
Figure 5.7 Column Info Window Showing Numeric Column Before and After Compression
To compress columns, select one or more columns and select Cols > 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” on page 372 in the “JMP Preferences” chapter.