Dear Avi,
I guess it's hard to formulate any rule of thumb.
Some analyses might not be defined if the number of variables exceed the
number of observations. Some other analyses might be defined (there is
many distance-based analyses nowadays which circumvent that problem).
However, whether a
Actually the rule is that the number of specimens should be larger than the
number of variables 2p-4 not p landmarks in the case of 2D data.
__F. James Rohlf, Distinguished Prof. Emeritus Dept.
Anthropology and Ecology & Evolution Stonybrook University
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