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a diary is also used to measure ratings in the radio industry. the ratings are listed based on quarter hours (every 15 minutes- :00-:15, :15-:30, :30-:45, and :45-:00) and time spent listening (tsl). you may hear your favorite station saying their call letters or station title at every break or at least every 15 minutes so that the diary keepers will remember what station they are listening to. quarter hours are desired more in most markets because that means that they are listening more often. for example:
if someone's tsl is 1 hour a day, it is assumed that the person never changed the station. they only listen from 7 am - 8 am everyday. if that same person listens for 4 quarter hours, then they could be listening at many more time slots throughout the day. if they listen from 7:10-7:25, that 15 minutes turns into 2 quarter hours instead of a straight 15 minutes. they turn the radio back on at 12:05 and listen until 12:20, another 15 mins., the station gets credit for 2 more quarter hours...and so on. it gets a little confusing when all the times and numbers are broken down, but this is just a quick hit on the subject.
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