On Aug 22, 2012, at 3:26 PM, Rich Shepard wrote:
I've searched the Web with Google and do not find what might cause
this
particular error from an invocation of cenboxplot:
cenboxplot(cu.t$quant, cu.t$ceneq1, cu.t$era, range=1.5, main='Total
Recoverable Copper', ylab='Concentration (mg/L)', xlab='Time Period')
Error in if (n > 0) (1L:n - a)/(n + 1 - 2 * a) else numeric() :
argument is of length zero
I do not an observation with a concentration of zero; the only
zeros are
the lower limits for censored observations.
It is not saying there are zero values for concentration.... it is
saying there are groups with zero elements:
> table(cu.t$ceneq1, cu.t$era)
Mining Pre-mining
FALSE 723 0
TRUE 183 9
The dput() output of the data frame 'cu.t' is attached.
--
David Winsemius, MD
Alameda, CA, USA
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