Radio programmers are now able to collect so much data about listener  habits that some have begun fine-tuning their shows down to the second  -- to the dismay of on-air personalities.  
  With
two years' worth of data from Arbitron's Portable People Meter,  program directors in some markets are figuring out the optimum ratio  of talk to music, or how many commercials a listener can bear
before  switching the dial. Now, "we can specifically see when the tune-ins  and tune-outs are," says Jimmy Steal, program director for Emmis's  KPWR in Los Angeles. "I can sit down with talent and
say, 'OK, I've  got a log. Here's what you were talking about. Out of 30 meters, you  lost 12.' "  
  In one instance, Steal decided not to invite back a guest after  realizing the station lost
listeners during each of his last three  airings on the morning show. "He wasn't exactly a lightning rod for  the meters," says Steal, declining to name the guest.
    
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