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Date:         Tue, 15 Jun 1999 10:42:22 -0500
Reply-To:     "Nichols, David" <nichols@SPSS.COM>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From:         "Nichols, David" <nichols@SPSS.COM>
Subject:      Re: Help for variance components model?

It sounds like you need to consult with a statistician familiar with your subject area to find out what the appropriate model is for your design. I'll be glad to help with the SPSS specifications for a given model, but I have to know what that model is.

David Nichols Principal Support Statistician and Manager of Statistical Support SPSS Inc.

> -----Original Message----- > From: Leena Lankoski [mailto:leena.lankoski@SOIKIO.FI] > Sent: Tuesday, June 15, 1999 3:29 AM > To: SPSSX-L@UGA.CC.UGA.EDU > Subject: Help for variance components model? > > > Dear all, > > I am a new subscriber to this list (to any list, in fact) and > wanted to see whether I could find some help with my problem > in this way. > > I need to run a variance components analysis with SPSS 8.0 > but I am not quite sure how to build the appropriate model > (i.e. what to put after the DESIGN command), even after > consulting the manuals and various textbooks. These are the facts: > > - The data include one observation from each combination of > plant/pollutant/year. (There are empty cells because all > combinations are not possible.) In addition, each plant is > classified into a detailed industry sector, which in turn are > classified into crude industry sectors. > - The question to be answered is how much of the variation in > the dependent variable is due to industry effects (measured > at a crude or detailed level), plant effects, pollutant > effects, year effects, or their combinations. > - It is my understanding that plant is nested within detailed > industry classification, which in turn is nested within crude > industry classification. It is also my understanding that at > least the year variable ought to be crossed with all others, > to divide the effects into stable and fluctuating components. > - Another problem is that some of the variables have many > levels, and therefore I often run into problems of "integer > overflow", "not enough memory", or "too many columns". I > wonder whether it would be possible to somehow split the > analysis to make it more manageable for the program? > > Thank you very much in advance for any help. > > Leena Lankoski > e-mail >

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