One of the advantages is suppose after you do an analysis with the proposed 5-year age groups you are asked about minor changes such as 0 to 12, 13-18, 19-25 and 26 and older with the 5 year groups. Just create a new format, which takes about 2 minutes and use the new format in the same analysis. The groups created by formats will be honored by almost every analysis, reporting and graphing procedure in SAS. You can also make one of your custom formats the default for the most common tasks but the custom formats are available for custom tasks. I have something like a dozen frequent to occasional use formats for age such as 3-year, 5-year, 10-year intervals plus specific age groups for topics related to specific medical testing recommended ages or key age groups for funding.
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