Re: No variables were entered into the equation SPSS

Posted by Bruce Weaver on Mar 19, 2013; 6:47pm
URL: http://spssx-discussion.165.s1.nabble.com/No-variables-were-entered-into-the-equation-SPSS-tp5718868p5718883.html

  /CRITERIA=PIN(.05) POUT(.10)

I suspect that if you ran a simple linear regression (i.e., one-predictor model) for each predictor, you would find that none of them are significant at the .05 level.

But you have much bigger fish than that to fry.  First, see these comments on why stepwise selection is almost always unwise:

  http://www.stata.com/support/faqs/statistics/stepwise-regression-problems/

Second, you have only 13 cases in your data file!  With such a small sample size, you might be able to fit a reasonable one-predictor model.  But trying to include multiple predictors is not advisable.  See Mike Babyak's nice article on over-fitting regression models:

  http://people.duke.edu/~mababyak/papers/babyakregression.pdf

HTH.

mimi wrote

Hi all,
I am trying to run a stepwise regression, I chose Analyze, I entered the variables, I ran the STEPWISE option analysis. The output screen indicates the following:
REGRESSION
  /DESCRIPTIVES MEAN STDDEV CORR SIG N
  /MISSING LISTWISE
  /STATISTICS COEFF OUTS CI(95) R ANOVA COLLIN TOL ZPP
  /CRITERIA=PIN(.05) POUT(.10)
  /NOORIGIN
  /DEPENDENT yield
  /METHOD=STEPWISE Mon65 Mon60 Mon55 Mon50 Tue65 Tue60 Tue55 Tue50 Wed65 Wed60 Wed55 Wed50 Thu65 Thu60 Thu55 Thu50
  /SCATTERPLOT=(*ZPRED ,*ZRESID)
  /RESIDUALS DURBIN HISTOGRAM(ZRESID) NORMPROB(ZRESID).
   
 

Warnings
No variables were entered into the equation.

 I appended the Data. Could you tell me what I am doing wrong?
Thanks in advance.
Data.xls