Dear all,
Thank you for your responses.
I apologize for the confusion on my data setup.
I am posting my exact data setup ( I hope it shows ok on the sent email):
WireType wireno trial IntrusionForce (N)
A 1 1 1.42016
A 1 2 1.47212
A 1 3 1.44614
A 1 4 1.43748
A 1 5 1.52407
A 2 1 1.50675
A 2 2 1.44614
A 2 3 1.43748
A 2 4 1.4115
A 2 5 1.43748
A 3 1 1.42016
A 3 2 1.38552
A 3 3 1.47212
A 3 4 1.40284
A 3 5 1.40284
A 4 1 1.49809
A 4 2 1.42016
A 4 3 1.24697
A 4 4 1.34222
A 4 5 1.31625
A 5 1 1.42882
A 5 2 1.54139
A 5 3 1.42882
A 5 4 1.43748
A 5 5 1.54139
B 1 1 1.26429
B 1 2 1.17769
B 1 3 1.35088
B 1 4 1.3249
B 1 5 1.29893
B 2 1 1.1344
B 2 2 1.14306
B 2 3 1.52407
B 2 4 1.42882
B 2 5 1.43748
B 3 1 1.29893
B 3 2 1.24697
B 3 3 1.22965
B 3 4 1.30759
B 3 5 1.29027
B 4 1 1.29027
B 4 2 1.16037
B 4 3 1.16037
B 4 4 1.35088
B 4 5 1.35088
B 5 1 1.43748
B 5 2 1.39418
B 5 3 1.46346
B 5 4 1.54139
B 5 5 1.54139
C 1 1 9.5168
C 1 2 9.24835
C 1 3 9.31763
C 1 4 9.27433
C 1 5 9.24835
C 2 1 9.25701
C 2 2 9.30897
C 2 3 9.4735
C 2 4 9.22238
C 2 5 9.24835
C 3 1 9.11846
C 3 2 9.07516
C 3 3 9.16176
C 3 4 9.07516
C 3 5 9.12712
C 4 1 9.5601
C 4 2 9.71597
C 4 3 9.84586
C 4 4 9.67267
C 4 5 9.17908
C 5 1 9.23104
C 5 2 9.17908
C 5 3 9.22238
C 5 4 9.17908
C 5 5 9.21372
D 1 1 1.02182
D 1 2 0.94389
D 1 3 1.01316
D 1 4 1.0045
D 1 5 0.96121
D 2 1 0.83997
D 2 2 0.83131
D 2 3 1.01316
D 2 4 1.08244
D 2 5 1.08244
D 3 1 0.83997
D 3 2 0.85812
D 3 3 0.9274
D 3 4 0.89276
D 3 5 0.78802
D 4 1 1.10284
D 4 2 1.02099
D 4 3 1.16903
D 4 4 1.16037
D 4 5 1.06512
D 5 1 1.0478
D 5 2 1.02182
D 5 3 0.95255
D 5 4 1.1344
D 5 5 0.98718
Thank you very much for your help.
Best wishes,
Nikolaos
--- On Sat, 3/14/09, David Airey <[email protected]> wrote:
From: David Airey <[email protected]>
Subject: Re: st: Repeated measures
To: [email protected]
Date: Saturday, March 14, 2009, 6:33 PM
.
I think measurements nested in wire is the residual in the model
anova force wiretype / wireno|wiretype /
-Dave
On Mar 14, 2009, at 11:26 AM, TA Stat wrote:
> I think it is measurements nested in specimen nested in wiretype.
> Your main objective is to identify whether variation among wiretype is
> significant or not. Right?
>
> Pete
>
> On Sat, Mar 14, 2009 at 11:12 PM, David Airey
> <[email protected]> wrote:
>> .
>>
>> I was confused by your data layout.
>>
>> Your data are really just 3 columns wide:
>>
>> WireType WireNo Force
>>
>> where wiretype and wireno are replicated 5 times,
>>
>> So
>>
>> anova force wiretype / wireno|wiretype /
>>
>> is fine, or the equivalent xtmixed...
>>
>> -Dave
>>
>> On Mar 14, 2009, at 3:16 AM, Nikolaos Pandis wrote:
>>
>>> Dear Statalisters,
>>>
>>> I have the following dataset (except I have it in long format-one
>>> measurement per row) :
>>>
>>> WireType WireNo Trial Force
>>>
>>> A A1 1,2,3,4,5 5 measurements-1 per trial
>>> A A2 1,2,3,4,5 5 measurements-1 per trial
>>> A A3 1,2,3,4,5 5 measurements-1 per trial
>>> A A4 1,2,3,4,5 5 measurements-1 per trial
>>> A A5 1,2,3,4,5 5 measurements-1 per trial
>>>
>>> B B1 1,2,3,4,5 5 measurements-1 per trial
>>> B B2 1,2,3,4,5 5 measurements-1 per trial
>>> B B3 1,2,3,4,5 5 measurements-1 per trial
>>> B B4 1,2,3,4,5 5 measurements-1 per trial
>>> B B5 1,2,3,4,5 5 measurements-1 per trial
>>>
>>>
>>> C C1 1,2,3,4,5 5 measurements-1 per trial
>>> C C2 1,2,3,4,5 5 measurements-1 per trial
>>> C C3 1,2,3,4,5 5 measurements-1 per trial
>>> C C4 1,2,3,4,5 5 measurements-1 per trial
>>> C C5 1,2,3,4,5 5 measurements-1 per trial
>>>
>>> D D1 1,2,3,4,5 5 measurements-1 per trial
>>> D D2 1,2,3,4,5 5 measurements-1 per trial
>>> D D3 1,2,3,4,5 5 measurements-1 per trial
>>> D D4 1,2,3,4,5 5 measurements-1 per trial
>>> D D5 1,2,3,4,5 5 measurements-1 per trial
>>>
>>> I am testing the forces generated by 4 different wiretypes to see
>>> if there
>>> are significant differences.
>>> For each wiretype (categorical A B C D) I am using 5 specimens
>>> (A1-5,..D1-5) and for each specimen I am repeating the measurement
>>> 5 times.
>>> The outcome is force and it is a continuous variable.
>>>
>>> This looks like a repeated measures with each trial nested in the
>>> WireNo
>>> and the WireNo nested inside WireType?
>>>
>>> I was trying to use the xtgee command but I was not sure how to
>>> construct
>>> it:
>>> xi:xtreg force i.xxxxx i.yyyyyy, i(zzzzz) ?
>>>
>>> Any help would be appreciated.
>>>
>>> Thank you very much,
>>>
>>> Nikolaos
>>>
>>>
>>>
>>>
>>> *
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>>
>> *
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>>
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