Hello list,
I haven’t seen an answer to this question. The footnote in the output is a bit ambiguous, but the online help gives a clear example:
http://127.0.0.1:56507/help/index.jsp?topic=/com.ibm.spss.statistics.help/syn_crosstabs.htm (look at the cells subcommand).
I have another remark about the same topic.
The syntax allows for /cells prob and /cells bprop.
Bprop uses the Bonferoni adjustment, while /prop doesn’t.
In the output however, it is not made clear if the adjustment has been made.
By the way: you can specify both, i.e. “ /cells prop bprop” without SPSS complaining (SPSS seems more tolerant then statisticians J) but nevertheless the program only gives one pair of subscripts and it remains unclear if the result is Bonferoni adjusted or not.
Antoon Smulders
Van: SPSSX(r) Discussion [mailto:[hidden email]] Namens Martin Sherman
Verzonden: donderdag 8 september 2011 23:21
Aan: [hidden email]
Onderwerp: new option in crosstabs- comparing column proportions
Dear list: Below is a crosstabs output and includes subscript letters which is new
Feature in spss. Compare column proportions which is presented in the Cell Display tab.
If I look at Column Y 1 and read down the percent we have 62.5% and 37.5% and then for Column
Y 2 we have 25% and 75% but the subscripts for Column 1 Y are all a’s and for Column 2 Y the
Subscripts are all b’s. So does this mean that 62.5% is sign. Different from 25.0% and that 37.5%
Is sign. Different from 75%. ??
x * y Crosstabulation | |||||
y | Total | ||||
1.00 | 2.00 | ||||
x | 1.00 | Count | 50a | 10b | 60 |
% within x | 83.3% | 16.7% | 100.0% | ||
% within y | 62.5% | 25.0% | 50.0% | ||
2.00 | Count | 30a | 30b | 60 | |
% within x | 50.0% | 50.0% | 100.0% | ||
% within y | 37.5% | 75.0% | 50.0% | ||
Total | Count | 80 | 40 | 120 | |
% within x | 66.7% | 33.3% | 100.0% | ||
% within y | 100.0% | 100.0% | 100.0% | ||
Each subscript letter denotes a subset of y categories whose column proportions do not differ significantly from each other at the .05 level. | |||||
Martin F. Sherman, Ph.D.
Professor of Psychology
Director of Masters Education in Psychology: Thesis Track
Loyola University Maryland
Department of Psychology
222 B Beatty Hall
4501 North Charles Street
Baltimore, MD 21210
410-617-2417
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