Re: Box's test warning

Posted by David Marso on Jun 13, 2013; 9:18pm
URL: http://spssx-discussion.165.s1.nabble.com/Box-s-test-warning-tp5720700p5720712.html

NPD = Non Positive Definite = VERY VERY BAD!
OTOH:  You have been naughty, so the MVA faeries are b-slapping you ;-)!
Hint:
data list list / v1 to v6.
begin data
44.389 22.886 21.503 25.124 15.228 16.916
22.886 19.302 3.584 11.095 7.594 8.462
21.503 3.584 17.919 14.029 7.635 8.454
25.124 11.095 14.029 19.374 9.533 9.521
15.228 7.594 7.635 9.533 9.892 5.853
16.916 8.462 8.454 9.521 5.853 13.457
55.915 26.646 29.269 38.409 13.996 26.429
26.646 21.635 5.011 16.137 9.195 11.583
29.269 5.011 24.258 22.271 4.801 14.846
38.409 16.137 22.271 34.081 8.639 19.834
13.996 9.195 4.801 8.639 9.501 5.089
26.429 11.583 14.846 19.834 5.089 20.452
end data.
COMPUTE test=v2 + v3.
COMPUTE brnfart=v1-test.
FORMATS ALL (F8.5).
LIST.




      V1       V2       V3       V4       V5       V6     TEST  BRNFART

44.38900 22.88600 21.50300 25.12400 15.22800 16.91600 44.38900   .00000
22.88600 19.30200  3.58400 11.09500  7.59400  8.46200 22.88600   .00000
21.50300  3.58400 17.91900 14.02900  7.63500  8.45400 21.50300   .00000
25.12400 11.09500 14.02900 19.37400  9.53300  9.52100 25.12400   .00000
15.22800  7.59400  7.63500  9.53300  9.89200  5.85300 15.22900  -.00100
16.91600  8.46200  8.45400  9.52100  5.85300 13.45700 16.91600   .00000
55.91500 26.64600 29.26900 38.40900 13.99600 26.42900 55.91500   .00000
26.64600 21.63500  5.01100 16.13700  9.19500 11.58300 26.64600   .00000
29.26900  5.01100 24.25800 22.27100  4.80100 14.84600 29.26900   .00000
38.40900 16.13700 22.27100 34.08100  8.63900 19.83400 38.40800   .00100
13.99600  9.19500  4.80100  8.63900  9.50100  5.08900 13.99600   .00000
26.42900 11.58300 14.84600 19.83400  5.08900 20.45200 26.42900   .00000


Number of cases read:  12    Number of cases listed:  12