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.
>> *
>>
>>
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>>
>
>
>
> --
> 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.

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