oldies76 said:
How can the same 100 people, then another 100, and another..etc..yield the same results? The same songs? That's impossible. You make it sound like these 100 people have a limited number of songs to choose from (based on repeated rotations), so they are "forced" to pick these same songs over and over again. A very deceptive way of conducting music surveys.
A music test does not have a single thing to do with "picking." In the best systems, an electronic dial is used, and participants are asked to score each song from 0 to 100 based on how much they would like to hear each one on the radio today. They hear "hooks" that are less than 10 seconds long of each song, one after another, and score each one.
Replication is a research technique to find out how small a sample has to be to be reliable. To replicate means to duplicate. So you test 100 people, and do the same test the same week with another 100 and still another. If all the tests yield statistically identical results for each song, then 100 is a usable test size, although even less than 100 might also be usable.
For that reason, replication is really a test of 300 persons or so, and we then use random interval or a random number generator to select sets of 100, then maybe of 80 or 70 and so on untill the results do not replicate. We have then found the ideal size for a music test.
Do you think all the hits (in their day) of 1965-1985 are presented to these evaluators, to choose from?
Over several tests, yes, all the viable songs are tested. Often big libraries are tested in two sessions for each respondant and they hear 600 songs the first night and 700 to 800 the second night. Each time songs are tested, the ones that failed miserably are not tested again, but marginal losers are and some additional songs are added.
Over a short period, several thousand songs are tested.
Because, if they were..you'd get varied results and a larger rotation as a result.
No, you would not get different results, and the optimum library size has been long ago determined by the listener.
These folks are choosing from a list of songs, that are already rotating, with maybe a few extras, right??
No, they are scoring, by listening to the hook (not choosing), of all the songs being played, rested, in fill and that might be playable and which have not been tested before or in a long time. Keep in mind that while such a station tests 35-54, for example, each year 5% of that demo are just entering it and another 5% are leaving,so there is audience turnover and that will change the scores, particularly at the old end and the young one... causing some newoer songs to score better and very old ones to drop.