In order to understand HASH and DOUBLE HASH concept in SAS you need to know about two different ranges of variables:
1) Numbered list:
When a set of variables have the same prefix, and the rest of the name is a consecutive set of numbers, we can use a single dash (-) to refer to an entire range. Some exs.. are….
VAR1 VAR2 VAR3 VAR4 VAR5
Shortcut list you can use to access all 5 variables is VAR1-VAR5
COL1 COL2 COL3 COL4 COL5 COL6 COL7
Shortcut list you can use to access all 7 variables is COL1-COL7
- Read more at: http://studysas.blogspot.com/2009/07/even-you-can-use-hash-and-double-dash.html
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