A format name must be a valid SAS name, start with a $ if the format is character, must not end in a number, and have a maximum length of 32. Also, the name of a user-defined format cannot be the same as the name of a format that is supplied by SAS.
The one and only FREE resource for general SAS online training as well as study guides for the SAS Base Certification. My goal is to create the SAS Certification prep guide that I never found but always wanted. This should also be a place to come if you are new to the language but are simply looking for online SAS training.