Re: Confidence interval is mathematically equivalent to hypothesis test

[John Darrington]

On Sat, Oct 13, 2018 at 04:04:41PM +0200, Werner LEMBERG wrote:
     
     > SORT CASES BY var1 [var2].
     > SPLIT FILE LAYERED BY?? var1 [var2].
     > 
     > T-TEST /TESTVAL=0
     > ?????? /VARIABLES= dependent variables ???? /MISSING=ANALYSIS
     > ?????? /CRITERIA=CI(insert your confidence level here, e.g. 0.95).
     
     Very nice, thanks!
     
     > Then you can use the means and the bounds of the confidence
     > intervals to draw your own graphs outside PSPP.
     
     How do I get the results of the T-TEST command shown on the console
     into the current dataset so that I can export them to a CSV file?
     
     
If I understand the use case properly, I think that you can do what you
want with with an aggregate followed by a few simple compute commands:


AGGREGATE OUTFILE * MODE ADDVARIABLES
    /BREAK=g
    /Mean = mean(V)
   /sd = sd(v)
   /n = n(v)
   .

compute ci_upper=mean + sd/sqrt(n).
compute ci_lower=mean - sd/sqrt(n).

list.

You might want to check out the continuous distribution functions too.
See section 7.7.10 of the user manual.

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