Plots ecdfs of one or more groups of censored data. Illustrates the differences between groups for group tests such as those done using cen1way or cenanova.
cen_ecdf( x.var, cens.var, xgroup = NULL, xlim = c(0, max(y.var)), Ylab = varname )
The column of data values plus detection limits
The column of indicators, where 1 (or
Optional - grouping or factor variable. Can be either a text or numeric value indicating the group assignment.
Limits for the x (data) axis of the ecdf plot. Default is 0 to the maximum of the y.var variable. To change, use option xlim = c(0, 50) if 50 is to be the maximum on the plot.
Optional – input text in quotes to be used as the variable name on the ecdf plot. The default is the name of the
Plots an empirical cumulative distribution function. If
group=NULL the ECDF of the entire dataset is produced. If
group is identified then ECDFs are plotted for each group seperately and a legend added.
Helsel, D.R., 2011. Statistics for Censored Environmental Data using Minitab and R, 2nd ed. John Wiley & Sons, USA, N.J. Millard, S.P., 2013. EnvStats: An R Package for Environmental Statistics. Springer-Verlag, New York.
# all data with(PbHeron, cen_ecdf(Liver, LiverCen))