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<font size=+1 face="helvetica, arial" color=cf8f00>About<br>Radio<br> Estimates</font>
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Arbitron® surveys rely on recall. Participants,
selected by a geographic and demographic model, are asked to keep a written
record of their listening. Typically, one respondent represents thousands of
"estimated" listeners. A predictable sample size will produce estimates with
a known statistically acceptable "level of confidence."
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<font size=+1 face="helvetica, arial" color=cf8f00>"Reel"<br>Listening<br> Reports</font>
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Unlike radio, we don't have to "estimate" the number of listeners or rely upon
the recall of randomly selected survey participants. Every Real Audio file that
is streamed by the server is recorded in the server logs.
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Our "survey participants" choose to participate if they have RealPlayer 3.0 or better, and have checked the "Send statistics to content provider" box under "Preferences/Connection" on their Real Audio players.
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<a href="RTSL-cume.html"><img src="images2/btncume.gif" width=100 height=34 alt="RANKED BY CUME" border=0></a>
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Last Survey, Ranked by CUME</font>
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Valid Time Spent Listening information can be collected only from
players enabled to send the information. A count of all players that
access files is maintained, and is considered the <b>TOTAL CUME</b>.
The <b>CUME</b> for any given file consists of only those who send statistics, as this is the only way to be sure that they have actually listened
to a file. The number of all players that report statistics is shown as the
players that <b>RESPONDED</b>, and also expressed as a percentage of all players.
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<a href="RTSL-tsl.html"><img src="images2/btntsl.gif" width=100 height=34 alt="RANKED BY TSL" border=0></a>
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Last Survey, Ranked by TSL</font>
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All time spent listening for each file is summed to determine the total time spent
listening for the file. The <b>TIME SPENT LISTENING TOTAL</b> is then divided
by the <b>CUME</b> for the file, to produce <b>AVERAGE TIME SPENT LISTENING</b>.
This is what is shown as <b>TSL</b>, and is expressed as MINUTES:SECONDS.
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<a href="RTSL-share.html"><img src="images2/btnshare.gif" width=100 height=34 alt="RANKED BY SHARE" border=0></a>
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Last Survey, Ranked by SHARE</font>
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Finally, the Time Spent Listening to ALL files is summed, and the TIME SPENT LISTENING TOTAL for each file is expressed as a percentage of total listening.
This is shown as <b>SHARE</b>, and it represents the percentage of total listening in the survey period that was contributed by the file.
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Your COMMENTS are invited.
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<font size=-2>©1997 Richard W. Irwin. All Rights Reserved</font>
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