[R] NADA Package: Referencing Data Frame Columns

[David Winsemius]

On Aug 7, 2012, at 11:31 AM, R. Michael Weylandt wrote:

> On Tue, Aug 7, 2012 at 11:26 AM, Rich Shepard <rshepard at appl-ecosys.com 
> > wrote:
>>  The sample data sets that come with the NADA package are limited  
>> to one or
>> two variables and a censored measurement indicator column. I try to  
>> mimic
>> examples using my data but keep missing the target.
>> snipped
>>
>>  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)
_______________^
Incorrect use of '&' when '$' was intended.

>> 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.
>>
>
>
> Take a look at with()
>
> Michael
>


David Winsemius, MD
Alameda, CA, USA