Thanks to all who have responded to my query.
Just wondering if you had any idea how large the sample would need to be to use multiple predictors in a multinomial logistic regression? My sample is 90.
Many thanks,
_________________
Fleur-Michelle Coiffait
Trainee Clinical Psychologist
University of Edinburgh & NHS Lothian
On 12 Oct 2010, at 17:50, Jeremy Miles wrote:
> Hi Fleur-Michelle,
>
> If you just wanted to run one risk-factor predictor at a time, then
> the chi-square test will be exactly the same as a multinomial logistic
> regression. (Note, that's the chi-square test you find buried under
> crosstabs in the SPSS menus, not the chi-square test that you find in
> non-parametric tests, which is different).
>
> If you have multiple predictors, then you need to use multinomial
> logistic regression. But you'll need a large sample, and you'll get a
> LOT of parameter estimates out, which will take some interpreting.
>
> If you have a large enough sample, I'd consider doing a principal
> components analysis first, to reduce the number of predictors.
>
> Jeremy
>
> On 12 October 2010 06:58, Fleur-Michelle Coiffait
> <[log in to unmask]> wrote:
>> Hi all
>>
>> I am analysing some data derived from routine information collected via a screening form, which has twelve 'risk factors' on it that get ticked if present (e.g. substance misuse, domestic abuse, etc). I am trying to look at whether the presence of any of these risk factors is related to three 'outcome' categories (no further service involvement, service X involvement, or social work involvement). I had initially thought about doing a Chi square analysis, but came across multinomial logistic regression and wondered if this might be more appropriate? Or are neither of these suitable analyses for this kind of data?
>>
>> I realise this may be a really silly question, but any advice/clarification would be much appreciated.
>>
>> Many thanks,
>> Fleur-Michelle
>> _________________
>> Fleur-Michelle Coiffait
>> Trainee Clinical Psychologist
>> University of Edinburgh & NHS Lothian
>>
>>
>>
>>
>>
>> --
>> The University of Edinburgh is a charitable body, registered in
>> Scotland, with registration number SC005336.
>>
>
>
>
> --
> Jeremy Miles
> Psychology Research Methods Wiki: www.researchmethodsinpsychology.com
>
--
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
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