Posted by
Allan Reese (Cefas) on
Nov 29, 2010; 10:01am
URL: http://spssx-discussion.165.s1.nabble.com/multiple-response-analysis-how-to-report-tp3281344p3284154.html
I can't point to a reference or discussion but my own experience is that
reporting the proportion of responses is less likely to be useful but
reporting the proportion of respondents must be done with clarity.
Case 1: "tick all that apply", in which case respondents report a
variable number and the total of responses is a random number. It might
seem you could report "X% of staff were described as type A", but the
unit of reporting appears to be the institution, and my first
inclination goes with "institutions reported having between -min- and
-max- professionals on their staff (mean -mean-). Y% of respondents
reported they had staff type A."
Case 2: "list your top three preferences". Number of responses is
(except for missing) 3 x number of respondents. I might try, "X% of
respondents reported A as their first preference, and Y% had A among
their top three."
The important thing is for the reader (and the author!) to be aware of
what it's a percentage of and whether it's exclusive. An example came
up last week on the BBC Radio 4 Today programme. A contributor claimed
"40% of your audience are probably listening on DAB." When this was
analysed, it appeared (this is my memory, check on bbc.co.uk/today
website) to be based on listener surveys that suggested about 33% of
listeners used digital -at some time during the week-. How the time
spent listening was split between digital and analogue was not reported.
Allan
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