Re: Turf Analysis - SPSS
Posted by
Jon K Peck on
Jan 30, 2012; 6:41pm
URL: http://spssx-discussion.165.s1.nabble.com/Turf-Analysis-SPSS-tp5442100p5442306.html
The reach of a set of variables gives the
number of cases where any variable in the set has a positive response,
and Pct of Cases shows what percentage of the cases are reached.
The frequency of a set of variables
gives the number of positive responses in the set. It is always greater
than or equal to the reach. The Pct of Responses shows the percentage
of the total number of positive responses that are accounted for in this
set,
If the data are
q1 q2
q3 q4
1 1
0 0
1 0
1 0
0 0
1 0
1 1
0 0
0 0
0 0
1 0
0 0
then the best two-variable reach is
q1 + q3. That reaches 5 cases - four from q1 plus incrementally 1
from q3, and the percentage is 5/6 * 100.
The frequency of q1 + q3 is 6, and the
percentage is 6/8 * 100. q1 + q3 accounts for 6 of the 8 total positive
responses.
In this dataset, q1 + q2 comes second
with a reach of 4, but its frequency is also 6 and therefore has the same
Pct of Responses.
HTH,
Jon Peck (no "h") aka Kim
Senior Software Engineer, IBM
[hidden email]
new phone: 720-342-5621
From:
Shamvir <[hidden email]>
To:
[hidden email]
Date:
01/30/2012 10:51 AM
Subject:
[SPSSX-L] Turf
Analysis - SPSS
Sent by:
"SPSSX(r)
Discussion" <[hidden email]>
Hello all,
In John's extension of turf the output has a column labelled "Pct
of
Responses", what is the data in this column and how was it calculated?
All responses will be highly appreciated,
Regards,
S.S.
--
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