Deal All,
I would like to compare differences among three time periods in the
availability of data (dichotomous variable).
In other words, i would like to see if there has been an improvement
in data collection (% available) in the last period compared to the
previous two ones.
I did a chi square originally but was advised by the reviewer a
chi-square for trend would be more appropriate.
How does one do this test and is it available in SPSS, does anybody know?
Thanks very much
Ioanna
Ioanna Vrouva
PhD Student
Research Department of Clinical, Educational and Health Psychology
University College London
1-19 Torrington Place, Room 451a
London WC1E 7HB
Tel: 0207 679 8273
Fax: 0207 916 1989
Email: [log in to unmask]
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