Dr. Barry Blesser, Director of Engineering, 25-Seven Systems just released a report which claims that although ARB's PPM 'can be expected to be extremely reliable when tested under "typical" conditions...there may be real-world scenarios that dramatically degrade PPM performance,' and encouraging 'radio stations that believe their listenership has been inaccurately reported by the PPM system may wish to determine if their context deviates from the assumptions upon which the PPM system is designed.'
Could "listening in a noisy environment or with the monitor positioned to receive only a muffled signal, increasing the likelihood that the PPM monitor will not correctly detect the stations' ID..." include inside a woman's purse? If so, could that explain why female listening to radio appears to be much lower as reported in PPM than it is in the diary ratings or why early morning listening levels are also so much lower?
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7 months ago