search for: costanza

Displaying 3 results from an estimated 3 matches for "costanza".

var/cov matrix for a quantile regression model
2007 Sep 17
1
var/cov matrix for a quantile regression model
...ession model (either linear or non linear), in order to get the variance of my predictions and be able to calculate the median squared error. The commands working for the lm models (corr=T or vcov=T) do not seem to work for the rq models. Could you advise me a way of getting it? Best regards Costanza Pizzi Medical Statistics Unit, LSHTM, London [[alternative HTML version deleted]]
maximum likelihood method to fit a model
2008 Jul 23
3
maximum likelihood method to fit a model
...gamma distribution function and log link. I have read in the help page that the default method used by R is "glm.fit" (iteratively reweighted least squares, IWLS). Is it possible to use maximum likelihood method? Thanks Silvia Narduzzi Dipartimento di Epidemiologia ASL RM E Via di S. Costanza, 53 00198 Roma Tel +39 06 83060461 Mail narduzzi at asplazio.it
cannot allocate vector of size...
2008 Jul 25
1
cannot allocate vector of size...
...#which should be the memory size > memory.size(max = TRUE) [1] 997.75 #which should be the maximum amount of memory obtained from the OS Could it be an hardware problem? or a code problem? Is there any solution? Thanks Silvia Narduzzi Dipartimento di Epidemiologia ASL RM E Via di S. Costanza, 53 00198 Roma Tel +39 06 83060461 Mail narduzzi at asplazio.it