[R] summary.lm as a post-hoc test?

[Dimitri Liakhovitski]

Then look at that package I referred in the other e-mail. It does
exactly what you need - I am just not sure if it's still available.
The author's e-mail is there, though - you can ask.
Good luck.
Dimitri

On Sat, Oct 30, 2010 at 5:04 PM, Alex Bokov <bokov at uthscsa.edu> wrote:
>
>
> On 10/30/2010 03:34 PM, Dimitri Liakhovitski wrote:
>>
>> You are asking a statistics question, not an R question. R-list people
>> never react to such posts.
>> Or they give you a nasty reply of the type: "Do you homework first,
>> and then ask questions here."
>>
>
> Good point. I thought it was an R question because it was about confirming
> what the output of an R function actually represents, and it is not
> explicitly documented in the help file. I was about 80% sure that it is what
> you just confirmed it to be in your answer, but I didn't want to yet again
> make an assumption about the behavior of this software that I'd have to
> retract later. I am going to hold on to my assumption that no multiple
> comparison corrections were done and it's up to me to do that.
>>
>> Each of the t tests for b:c2, b:c3, and b:c4 test the null hypotheses:
>> difference in slopes of a onto b between groups scored c2 (or c3 or
>> c4) and the group scored c1 is equal to zero.
>
> Yes! This is precisely the hypothesis I'm testing at the moment.
>>
>> The package I refered to seems to be what you want.
>>
>
> Thank you, I will look into that because most of the time I really do need
> to do pairwise tests of all combinations. Just not this time.
>
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-- 
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com