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From |
"Michael Cha" <mikecha0@lycos.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Calculation of total effects and the significance test of indirect effect |

Date |
Thu, 30 Sep 2004 02:05:14 -0500 |

Dear listers, I am writing to ask a few questions regarding the calculation of total effect = direct effect + indirect effect. Suppose I am interested in the relationship between X and Y and Z. I also have demographic variables to consider such age and sex. 1) My first question is, If I want to calculate the total effect of X on Y, do I have to control for Age and Sex or not? In other words, is Rxy the total effect or Rxy.age,sex the total effect? 2) My second question is, As far as I know, the SEM package softwares (e.g. Lisrel or Amos) automatically calculate the direct and indirect effect of included components. Unfortunately, I now do not use such softwares but just SPSS, and need to calculate the total, direct and indirect effect between X Z and Y. Then, is there anyway to test the significance of indirect effect of path coefficients a*b (which are multiplied indirect effects of the path from X to Z(a) and Z to Y(b)? Thank you very much for your attention and help in advance and sorry if these are too basic questions to look at. I will appreciate it much more if you can suggest any reading materials to grasp these topics more clearly. Regards, Mike -- _______________________________________________ Find what you are looking for with the Lycos Yellow Pages http://r.lycos.com/r/yp_emailfooter/http://yellowpages.lycos.com/default.asp?SRC=lycos10 * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Calculation of total effects and the significance test of indirect effect***From:*Richard Williams <Richard.A.Williams.5@nd.edu>

**Re: st: Calculation of total effects and the significance test of indirect effect***From:*Richard Williams <Richard.A.Williams.5@nd.edu>

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