[R] aov and missing values

Pedro J. Aphalo pedro.aphalo at joensuu.fi
Fri Nov 3 15:10:54 CET 2000

I am learning R, and although I have looked in the documentation, I may
be asking something obvious. Sorry, if that is the case. 

In a split-plot design if there is a missing subunit summary gives me a
table with two rows for the same factor, one in the error within section
and one in the section using error between units. With no data missing
the table is "normal". How does one interpret the table when data is
missing?, or is it that aov cannot cope with missing values in this

Thanks in advance for any help.


The model I am using is of the form "y ~ A * B * C + block +
Error(A/B)", I tried the simpler model "y ~ A * B + block + Error(A)"
with the same result.

The behaviour is the same in Version 1.1.1 and Version 1.2.0 Under
development (unstable) (2000-10-11). If it matters, I am using Windows.

 Pedro J. Aphalo
 University of Joensuu
 Faculty of Forestry
 P.O. Box 111, FIN-80101 Joensuu, FINLAND
 mailto:pedro.aphalo at joensuu.fi
 fax: +358 13 251 4444
 tel: +358 13 251 4406                         ,,,^..^,,,
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