Date:         Thu, 18 Jan 2007 02:09:08 -0500
Reply-To:     Ankur Arora <ankur.arora@NAGARRO.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Ankur Arora <ankur.arora@NAGARRO.COM>
Subject:      Re: problem of parametric trend test
Comments: To: "David L. Cassell" <davidlcassell@MSN.COM>
Content-Type: text/plain; charset=ISO-8859-1

Hi David,

I have a dataset like this

group     Independent variable

1         123
1         124
1         122
2         123
2         111
2         123
3         123
3         123
3         344
4         123
4         234

so my class the variable is group.

1) I had one option with proc logistics

proc logistic;
model GROUP(order=internal ref="1")=var to be analysed /
link=glogit risklimits;
run;

1 :is the control group
so basically finding trend by comparing with the control group.

2) option is to use proc reg with contrast statement
but here we are not specifying any control group

how do i generate the contrast coeficient acording to no of groups
because i need to program a macro where no of groups can change
so i need to generate contrast statement at run time.

I am confused how to calculate the trend.
could you throw light on how to do parametric trend statistically.

so how do I set the parametric trend.

Thanks
Ankur







Original Message:
-----------------
From: David L Cassell davidlcassell@MSN.COM
Date: Wed, 17 Jan 2007 22:27:36 -0800
To: SAS-L@LISTSERV.UGA.EDU
Subject: Re: problem of parametric trend test


ankur.arora@NAGARRO.COM wrote:
>
>Hi All,
>
>
>I want to perform parametric trend test in sas.
>
>Can anybody advise how to perform the parametric trend test in sas.
>
>Thanks in advance.
>
>Thanks
>Ankur

There is no single "the parametric trend test", unfortunately.  And if
there were only one, it probably wouldn't work for most data sets.  :-(

So you need to describe your data and meta-data in a lot more detail,
with some discussion on the overall goal here, so we have some idea of
what kind of test is likely to be reasonable.

Then you would end up having to check the assumptions of whatever
test gets recommended, and decide if the test can even be applied
to your data.

HTH,
David
--
David L. Cassell
mathematical statistician
Design Pathways
3115 NW Norwood Pl.
Corvallis OR 97330

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