search for: cenros

Before reading water chemistry into a data frame I removed all missing data. Yet when I try to run cenros() to summarize a specific chemical I get an error that I do not understand: with( subset(chem, param=='Ag'), cenros(quant,ceneq1) ) Error in lm.fit(x, y, offset = offset, singular.ok = singular.ok, ...) : NA/NaN/Inf in 'y' I would like to learn what I did incorrectly so I c...

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

...ilable 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' data frame. Rich

I have water chemistry data with censored values (i.e., those less than reporting levels) in a data frame with a narrow (i.e., database table) format. The structure is: $ site : Factor w/ 64 levels "D-1","D-2","D-3",..: 1 1 1 1 1 1 1 1 ... $ sampdate: Date, format: "2007-12-12" "2007-12-12" ... $ preeq0 : logi TRUE TRUE TRUE TRUE TRUE

Just had a good laugh. I'm sitting here at my desk working with my laptop sitting off to the side; I've just loaded C6 this morning and as I understand it C6 _just_ finished syncing on the mirrors over the weekend. I look up from an email I'm composing to see the updates alert being displayed. I won't repeat what first entered my head, but I couldn't help but laugh and think,

...) > 66. Changing x-axis values displayed on histogram (jlwoodard) > 67. Re: Package 'MASS' (polr): Error in svd(X) : infinite or > missing values in 'x' (Rune Haubo) > 68. Re: HELP me please with import of csv to R (Sarah Goslee) > 69. Understanding cenros Error (Rich Shepard) > 70. Re: Need HELP: how find and use a csv file? (Sarah Goslee) > 71. Re: calculating the difference between days? (C W) > 72. Re: Need HELP: how find and use a csv file? (Rich Shepard) > 73. Re: calculating the difference between days? (C W) > 74...