Message-ID: <alpine.LNX.2.00.1207051311310.11434@salmo.appl-ecosys.com>
Date: 2012-07-05T20:15:33Z
From: Rich Shepard
Subject: NADA Data Frame Format: Wide or Long?
In-Reply-To: <CC1B3E36.A05E6%macqueen1@llnl.gov>
On Thu, 5 Jul 2012, MacQueen, Don wrote:
> This example follows exactly the example in ?cenros.
> with( subset(yourdataframe, param=='Ag'), cenros(quant,ceneq1) )
> This should do a simple censored summary statistica calculation for silver
> (assuming quant contains your reporting level for censored results, which
> appears to be the case).
Don,
That makes sense to me. I was hoping to avoid subsetting the data frame
for each of the 37 chemical parameters, but ... I will review the use of
with().
> I'd also suggest you try to load your data so that site and param are not
> factors, though this could depend on your ultimate analysis.
I do need to differentiate results by site and chemical paramater.
Many thanks,
Rich