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Date:         Thu, 16 Dec 2010 18:22:29 -0800
Reply-To:     Bruce Weaver <bruce.weaver@hotmail.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Bruce Weaver <bruce.weaver@hotmail.com>
Subject:      Re: Can I use time and gender as covariates in Ancova?
In-Reply-To:  <AANLkTik83U_TLghzYgh90E9Mf0v4ES-_SUWxRXQdpipq@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

You can include them as "fixed factors", as Art suggested on Dec 15.

PetterBB wrote: > > Thanks for your comment. Unfortunately, I do not have the actual age, only > age described in 15 different categories.....will this then mean that I > can > not use this as covariates? Do you have any advice? > > best > petter > > 2010/12/16 Bruce Weaver [via SPSSX Discussion] < > ml-node+3308697-636471153-145201@n5.nabble.com<ml-node%2B3308697-636471153-145201@n5.nabble.com> >> > >> PetterBB wrote: >> Hi I thought that with the use of ANCOVA the analysis will adjust the >> means >> of the outcome variable to what they would be if all subjects scored >> equally >> on the covariates; gender and age....it this wrong? >> >> best >> Petter Bae Brandtzæg. >> >> One of the problems you're running into in this thread is terminological. >> In SPSS lingo, covariate = continuous (or scaled) explanatory variable, >> and >> factor = categorical explanatory variable. So the variables you are >> describing as "covariates" are being seen by Art (and others) as >> "factors", >> because you have age categories, not age as a continuous variable. Do >> you >> have the actual ages? If so, why are you treating it as categorical? >> >> -- >> Bruce Weaver >> bweaver@lakeheadu.ca >> http://sites.google.com/a/lakeheadu.ca/bweaver/ >> >> "When all else fails, RTFM." >> >> *NOTE: My Hotmail account is not monitored regularly. >> To send me an e-mail, please use the address shown above. >> * >> >> >> ------------------------------ >> View message @ >> http://spssx-discussion.1045642.n5.nabble.com/Can-I-use-time-and-gender-as-covariates-in-Ancova-tp3306510p3308697.html >> >> To unsubscribe from Can I use time and gender as covariates in Ancova?, >> click >> here<http://spssx-discussion.1045642.n5.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=3306510&code=cGV0dGVyLmIuYnJhbmR0emFlZ0BnbWFpbC5jb218MzMwNjUxMHwtMzQ1Mjg3OTM5>. >> >> > > > > -- > Petter Bae Brandtzæg > Ustvedtsvei 14b O871 Oslo > Tlf + 4792806546 > >

----- -- Bruce Weaver bweaver@lakeheadu.ca http://sites.google.com/a/lakeheadu.ca/bweaver/

"When all else fails, RTFM."

NOTE: My Hotmail account is not monitored regularly. To send me an e-mail, please use the address shown above.

-- View this message in context: http://spssx-discussion.1045642.n5.nabble.com/Can-I-use-time-and-gender-as-covariates-in-Ancova-tp3306510p3308881.html Sent from the SPSSX Discussion mailing list archive at Nabble.com.

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