Long vs. wide data entering in statistical software. when to use long format data entering?
In repeated measure data both wide and long form data could be used.
Stata analyzes repeated measures for both anova and for linear mixed models in long form. On the other hand, SAS and SPSS usually analyze repeated measure anova in wide form. However, both SAS and SPSS require the use long data mixed models.
http://www.ats.ucla.edu/stat/stata/seminars/repeated_measures/repeated_measures_analysis_stata.htm
A Comparison of the Two Approaches:
One reason for setting up the data in one format or the other is simply that different analyses require different set ups.
For example, in all software that I know of, the wide format is required for MANOVA and repeated measures procedures.
Many data manipulations are much, much easier as well when data are in the wide format.
Likewise, mixed models and many survival analysis procedures require data to be in the long format.
http://www.theanalysisfactor.com/wide-and-long-data/
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