https://communities.sas.com/t5/Statistical-Procedures/cluster-analysis-after-factor-analysis-do-I-need-to-use-all/m-p/284968#M15044 <P>Hi,</P> <P>&nbsp;</P> <P>It depends, if you are happy with 3 cluster solutions with 7 factors then you can drop 8th factor. &nbsp;</P> Fri, 15 Jul 2016 20:48:20 GMT stat_sas 2016-07-15T20:48:20Z https://communities.sas.com/t5/Statistical-Procedures/cluster-analysis-after-factor-analysis-do-I-need-to-use-all/m-p/284953#M15039 <DIV class="post-text"> <P>I have a 127-question survey with 6-level likert type answers. With EFA I have kept 56 items and got 8 factors. With CFA (on sample not used in EFA) I confirmed these factors. so far all good.</P> <P>&nbsp;</P> <P>When I tried to do cluster analysis, with 8 all factors I did not get clear solution (I used SAS, and used the CCC and pseudo F and T statistics indicators to judge the number of clusters; ccc: Cubic Clustering Criterion).</P> <P>&nbsp;</P> <P>When I used 7 factors, I got a clearly solution of 3 clusters. All three indicators (CCC, pseudo F and statistics) suggested cluster number of 3. And further analysis with 3 clusters looks very reasonable to us.</P> <P>&nbsp;</P> <P>my question is: Do I must use all 8 factors from EFA/CFA to do cluster analysis?</P> <P>&nbsp;</P> </DIV> Fri, 15 Jul 2016 19:41:20 GMT https://communities.sas.com/t5/Statistical-Procedures/cluster-analysis-after-factor-analysis-do-I-need-to-use-all/m-p/284953#M15039 fengyuwuzu 2016-07-15T19:41:20Z https://communities.sas.com/t5/Statistical-Procedures/cluster-analysis-after-factor-analysis-do-I-need-to-use-all/m-p/284968#M15044 <P>Hi,</P> <P>&nbsp;</P> <P>It depends, if you are happy with 3 cluster solutions with 7 factors then you can drop 8th factor. &nbsp;</P> Fri, 15 Jul 2016 20:48:20 GMT https://communities.sas.com/t5/Statistical-Procedures/cluster-analysis-after-factor-analysis-do-I-need-to-use-all/m-p/284968#M15044 stat_sas 2016-07-15T20:48:20Z