Message-ID: <alpine.LNX.2.00.1208160806100.28732@salmo.appl-ecosys.com>
Date: 2012-08-16T15:08:52Z
From: Rich Shepard
Subject: NADA package/cenboxplot() method: maximum censored percentage
In-Reply-To: <OF20F4380E.7760393F-ON86257A5C.004416C3-86257A5C.0044A773@usgs.gov>
On Thu, 16 Aug 2012, David L Lorenz wrote:
> The cenboxplot function uses cenros to estimate the censored values. The
> cenros function requires at least 2 uncensored observations to be able to
> do the regression. The cenros function does issue a warning when there are
> more than 80% censored data, but that is suppressed in cenboxplot.
Dave,
I've seen the cenros warning when there are > 80% censored data, and now
understand that I don't see the same warning with cenboxplot. Knowing now
that I need at least 2 uncensored observations answers my question; some of
the constituents have only a single uncensored value. Others have none, and
I knew those could not be analyzed or plotted.
> Hope this helps.
Most certainly does!
Thanks very much,
Rich