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From |
Joerg Luedicke <joerg.luedicke@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: factor analysis - calculating Crohnbach's alpha |

Date |
Tue, 9 Oct 2012 15:34:52 -0500 |

On Tue, Oct 9, 2012 at 3:12 PM, Kerry MacQuarrie <Kerry.MacQuarrie@icfi.com> wrote: It seems to me that SPSS automatically generated a table with each factor and its items' factor loadings and the Crohnbach's alpha for each factor. I don't even see how that would be possible? How would SPSS select the variables for calculating Cronbach's alpha? For example, if we do: *----------------------------------------------------------------------- use http://www.stata-press.com/data/r11/bg2.dta, clear fact bg2cost1 bg2cost2 bg2cost3 bg2cost4 bg2cost5 bg2cost6, pcf rot, oblique promax *----------------------------------------------------------------------- we get: ------------------------------------------------- Variable | Factor1 Factor2 | Uniqueness -------------+--------------------+-------------- bg2cost1 | 0.6998 0.2646 | 0.4775 bg2cost2 | 0.0244 0.7163 | 0.4898 bg2cost3 | 0.0244 0.7840 | 0.3886 bg2cost4 | -0.1212 0.5652 | 0.6521 bg2cost5 | 0.7257 -0.0844 | 0.4539 bg2cost6 | 0.7346 -0.1178 | 0.4290 Now, which of the items would you use for scale 1 and scale 2? And which ones would SPSS use? I feel the only way of automating this would be to define some arbitrary thresholds which I would consider as either bad or more time consuming than an extra command line (because you would have to run it more than once in order to figure out what you would regard a reasonable threshold). Joerg * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: factor analysis - calculating Crohnbach's alpha***From:*"JVerkuilen (Gmail)" <jvverkuilen@gmail.com>

**References**:**st: factor analysis - calculating Crohnbach's alpha***From:*Kerry MacQuarrie <Kerry.MacQuarrie@icfi.com>

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