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2003 Sep 30
1
can't get names from vector in nlm calls
I've been trying to figure out how to get the names of the parameter vector
variables when inside the function that nlm calls to return the objective
function value:
knls <- function( theta, eqns, data, fitmethod="OLS", instr=NULL, S=NULL )
{
## print( names( theta ) ) # returns NULL
## get the values of the parameters
for( i in 1:length( theta ) )
2003 Oct 06
1
getting names of p vector in nlm function...
Dear R programming folks:
I'm trying to finish off a package for non-linear simultaneous system
estimation and I've been trying to figure out how to get the names of the
parameter vector variables when inside the function that nlm calls to return
the objective function value:
knls <- function( theta, eqns, data, fitmethod="OLS", instr=NULL, S=NULL )
{
## print(
2006 Nov 30
0
Standardized deviance residuals in plot.lm
...x with plot(x) are calculated as
r <- residuals(x)
s <- sqrt(deviance(x)/df.residual(x))
w <- weights(x)
hii <- lm.influence(x)$hat
r.w <- if (is.null(w)) r else (sqrt(w) * r)
rs <- r.w/(s * sqrt(1 - hii))
This implies that, for example, for binomial B(ni,pi) data the devaince
residials (which are just r) are weighted not only with sqrt(1-hii), but
also with 1/sqrt(ni) and s, leading to absurd values. As a result all
leverage/outlier diagnostics is absolutly wrong.
Am I right and this should be reported as a bug?
Many thanks,
Tatyana
--
Tatyana Krivobokova
Bielefeld Universi...