Date: Sun, 7 Sep 2008 08:58:43 -0400
Reply-To: Arthur Tabachneck <art297@NETSCAPE.NET>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Arthur Tabachneck <art297@NETSCAPE.NET>
Subject: Re: interpreting SAS output
G Ren,
It would help the list if you showed your code and some sample data.
I don't know why you would expect to get different SEs. You might want to
look at UCLA's stats page for some explanations of the output (e.g.,
http://www.ats.ucla.edu/stat/sas/library/SASSlice_os.htm ).
http://www.ats.ucla.edu/stat/sas/library has a lot of good examples.
I would expect that you would be plotting means in order to see the
interactions.
As for applying transformations, I would think you would only do that if
you had a reason (e.g., the data don't appear to be normally distributed or
theory suggests that they aren't normally distributed).
Art
--------
On Sat, 6 Sep 2008 21:47:52 -0700, globalreviewer@gmail.com
<globalreviewer@GMAIL.COM> wrote:
>Hello,
>I have some very basic questions on reading SAS output. I ran a two
>way anova with the model :
>[x = a b a x b ] as a Mixed analysis and got significant result for
>the interaction term (a x b). Factor 'a' has 2 levels and 'b' has 6. I
>plotted the estimates from this analysis as follows:
>
>a1b1, a1b2, ...a1b6, a2b1, a2b2 .... a2b6. I also got the SE values
>from the output as (estimate x SE) values and I plotted it as a line
>graph. I am interested in each level of interaction so I also wrote
>contrasts for the levels of interest. However, on plotting the above
>estimate values with the SE values, factors that show significance in
>my contrast statement (or even the pdiff statement) dont show
>significance on the graph. I am not sure what I am doing wrong.. also
>I cannot seem to recover 'similar' SE values if I use different
>transformations (ie sqrt and log). I am sure I am doing some real
>fundamental mistake because I have not encountered this problem in any
>of my classes where I learnt SAS!
>
>Please help...
>G Ren
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