Displaying 3 results from an estimated 3 matches for "unweigth".
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weigth
2012 Sep 19
0
Discrepancies in weighted nonlinear least squares
Dear all,
I encounter some discrepancies when comparing the deviance of a weighted and
unweigthed model with the AIC values.
A general example (from 'nls'):
DNase1 <- subset(DNase, Run == 1)
fm1DNase1 <- nls(density ~ SSlogis(log(conc), Asym, xmid, scal), DNase1)
This is the unweighted fit, in the code of 'nls' one can see that 'nls'
generates a vector...
2013 Feb 12
0
Deviance and AIC in weighted NLS
Dear All,
I encounter some discrepancies when comparing the deviance of a weighted and
unweigthed model with the AIC values. A general example (from 'nls'):
DNase1 <- subset(DNase, Run == 1)
fm1DNase1 <- nls(density ~ SSlogis(log(conc), Asym, xmid, scal), DNase1)
Now for a weighted fit:
fm2DNase1 <- nls(density ~ SSlogis(log(conc), Asym, xmid, scal),
DNas...
2004 Mar 04
3
Testing significance in a design with unequal but proportional sample sizes
Hi, all
I have a rather un-ideal dataset that I am trying to work with, and would
appreciate any advice you have on the matter.
I have 4 years worth of data taken at 3 depth-zones from which samples have
been taken at random. I am looking at the abundance of organism A between depth
zones and across years, and am interested in the possible interaction of
organism A distributions shifting