search for: cenboxplot

One set of data has censored (less-than detection limits) water chemistry concentrations for 80-100% of all observations. My initial trial-and-error attempts to apply the cenboxplot() method suggests that it has an upper limit to the percentage of censored observations. I do not see this limit in Dennis Helsel's second edition. Has anyone experience plotting censored data and can provide me with the maximum percentage of censored data in a set of observations? TIA, R...

Rich, The documentation for cenboxplot states that the second argument must be logical and not integer. the function cenboxplot substitutes synthetic values for censored values using ros, hence the error message from the ros method. I also do not understand how you expect group = 'SO4' to work. It is not clear that the fun...

...$ ceneq1 : int 1 0 0 0 0 0 0 0 0 0 ... $ low : num 0 7.69 0.02 63.8 120 0.02 399 439 2 433 ... $ high : num 0.01 7.69 0.02 63.8 120 0.02 399 439 2 433 ... What I want to first learn is how to specify a box plot (and whether I can use the lattice package) for specific chemicals. ?cenboxplot shows me the arguments, but I'm not entering them correctly, or there's a prerequisite step I need to take: cenboxplot(waterchem$quant, waterchem$ceneq1, group='SO4', log=T, range=1.5) Error in function (classes, fdef, mtable) : unable to find an inherited method for function &...

I've gone over the data and do not see my error; the dput() output of the data frame and the pdf output of cenboxplot() are attached. The command used: cenboxplot(sb.t$quant, sb.t$ceneq1, range=1.5, main='Total Recoverable Antimony', xlab='Pre-Mining Era', ylab='Concentration (log mg/L)') (on a single line in emacs). The RL on the plot is drawn at 0.01 rather than at 0.005 and I...

...hat is, that the ceneq1, floor, and ceiling values are available for each site, sampdate, and chemical. Is the appropriate way to use the NADA methods for analyses and plotting to subset each chemical separately from the 'chem' data frame? Or, is there a syntax other than, for example, cenboxplot(chem&Vdis, chem$ceneq1, chem$era) Error in cenros(obs[group == i], cen[group == i]) : error in evaluating the argument 'obs' in selecting a method for function 'ros': Error: object 'Vdis' not found I get the same error when trying to use the 'chem.cast' da...

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 c...