In my experience, it is generally due to something like this example:
as.numeric(c('1','b','2'))
[1] 1 NA 2
Warning message:
NAs introduced by coercion
There may be other operations that generate that error, I can't say
for sure. But the above example illustrates what I look for when I
get that particular message.
-Don
At 10:52 AM -0700 11/23/09, Omar Gonzalez Post wrote:
I'm running cluster analysis on a data frame but when I calculate
the distance I get this warning "NAs introduced by coercion". What
does this mean?
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--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
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