From dvdbooth at cs.com  Mon Mar 16 00:30:09 2009
From: dvdbooth at cs.com (dvdbooth at cs.com)
Date: Mon, 16 Mar 2009 00:30:09 +0100 (CET)
Subject: [Rd] Bug Report Fwd: MANOVA Data (PR#13595)
Message-ID: <20090315233009.B117E282C768@mail.pubhealth.ku.dk>


 Hi.? There appears to be a bug in R function manova.? My friend and I both ran it the same way as shown below (his run) with the shown data set. His results are shown below. we both got the same results.? I was running with R 2.3.1. I'm not sure what version he used.
Thanks very much,
David Booth
Kent State University


 


 

-----Original Message-----
From: dvdbooth at cs.com
To: kberk at ilstu.edu
Sent: Sun, 15 Mar 2009 7:01 pm
Subject: Re: MANOVA Data











 Ken,

Did you notice that Wilks, Roy, etc p-values are all the same?? Pillai is almost the SAS result.? Can't figure it out.? I'll submit a bug report. What's Velleman going to talk about?? Thanks for looking at the R.

Best,

Dave





 





 



-----Original Message-----

From: Ken Berk <kberk at ilstu.edu>

To: dvdbooth at cs.com

Sent: Sun, 15 Mar 2009 3:45 pm

Subject: Re: Fwd: MANOVA Data














At 08:07 PM 3/5/2009, you wrote:



Hi Ken,


I've run the attached data set ( a one way MANOVA ex. from the SAS manual
chapter on MANOVA) in both SAS and R and I don't get the same
results.? Do you have any suggestions about how I can find out
what's going on?


Thanks,


Dave







-----Original Message-----


From: dvdbooth at cs.com


To: DvdBooth at aol.com


Sent: Thu, 5 Mar 2009 5:06 pm


Subject: MANOVA Data










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Hello, David




My R results are clearly crap, as shown below.




The degrees of freedom are clearly wrong, as is apparent when looking at
the univariate anovas.




SAS gives the correct answers.




I don't know what to do about R.




Ken







COUNT??? REWGRP??? COMMIT???
SATIS??? STAY


1????
1????????
16???????
19?????? 18


2????
1????????
18???????
15?????? 17


3????
1????????
18???????
14?????? 14


4????
1????????
16???????
20?????? 10


5????
1????????
15???????
13?????? 17


6????
1????????
12???????
15?????? 11


7????
2????????
16???????
20?????? 13


8????
2????????
18???????
14?????? 16


9????
2????????
13???????
10?????? 14


10??? 2????????
17???????
13?????? 19


11??? 2????????
14???????
18?????? 15


12??? 2????????
19???????
16?????? 18


13??? 3????????
20???????
18?????? 16


14??? 3????????
18???????
15?????? 19


15??? 3????????
13???????
14?????? 17


16??? 3????????
12???????
16?????? 15


17??? 3????????
16???????
17?????? 18


18??? 3????????
14???????
19?????? 15




> attach(booth)


> Y <- cbind(COMMIT, SATIS, STAY)


> fit <- manova(Y ~ REWGRP)


> summary(fit, test="Pillai")


????????? Df? Pillai
approx F num Df den Df Pr(>F)


REWGRP???? 1 0.22731?
1.37283????? 3???? 14
0.2918


Residuals
16?????????????????????????????????????



> summary(fit, test="Wilks")


????????? Df??
Wilks approx F num Df den Df Pr(>F)


REWGRP???? 1 0.77269?
1.37283????? 3???? 14
0.2918


Residuals
16?????????????????????????????????????



> summary(fit, test="Hotelling-Lawley")


????????? Df
Hotelling-Lawley approx F num Df den Df Pr(>F)


REWGRP????
1????????? 0.29418?
1.37283????? 3???? 14
0.2918


Residuals
16??????????????????????????????????????????????



> summary(fit, test="Roy")


?????????
Df???? Roy approx F num Df den Df Pr(>F)


REWGRP???? 1 0.29418?
1.37283????? 3???? 14
0.2918


Residuals
16?????????????????????????????????????



> summary(fit)


????????? Df? Pillai
approx F num Df den Df Pr(>F)


REWGRP???? 1 0.22731?
1.37283????? 3???? 14
0.2918


Residuals
16?????????????????????????????????????



> summary.aov(fit)


?Response COMMIT :


???????????
Df? Sum Sq Mean Sq F value Pr(>F)


REWGRP?????? 1??
0.333?? 0.333? 0.0532 0.8204


Residuals?? 16 100.167??
6.260??????????????





?Response SATIS :


???????????
Df? Sum Sq Mean Sq F value Pr(>F)


REWGRP?????? 1??
0.750?? 0.750? 0.0945 0.7625


Residuals?? 16 127.028??
7.939??????????????





?Response STAY :


??????????? Df Sum
Sq Mean Sq F value Pr(>F)


REWGRP?????? 1 14.083? 14.083?
2.3013 0.1488


Residuals?? 16 97.917??
6.120??????????????





> 




 






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[Rd] Bug Report Fwd: MANOVA Data (PR#13595)
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