Displaying 4 results from an estimated 4 matches for "wnnperer".
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wanderer
2012 Mar 13
1
Two dimensional integration
Dear R Members,
I want to know a fast R function to do multidimensional integration. I used
the function 'cuhre' in R2cuba library. But it takes painful time to get the
answer.
I would be thankful if anyone could help me out to solve this problem
Thanks
Niroshan
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Sent
2012 Mar 14
2
Maximization problem in the optim function
Dear R Users
I am maximizing a user defined log likelihood function. It includes variance
parameter (sigma). I used R function optim with BFGS maximization method.
However, it stops before the solution saying ?sqrt(sigma): NaNs produced?
Could anybody know a proper transformation for sigma which can be passed in
the function? For the correlation parameter I used Fishers? transformation
so it
2012 Mar 13
1
how to write crossed and nested random effects in a model
Dear R Users,
I have a question based on my research. I am analyzing reader-based
diagnostic data set. My study involves diabetic patients who were evaluated
for treatable diabetic retinopathy based on the presence or absence of two
pathologies in their eyes. Pathologies were identified using the clinical
examination (Gold standard method). In addition it can be identified by
taking digital
2012 Jan 02
0
How to get cov matrix of regression parameters in GEE using 'geese' or 'geeglm''
Dear R users,
I fitted a GEE model using the function 'geese' (or 'geeglm') with user
defined
correlation matrix. I want to get the var-cov matrix of the regression
coefficients. But the output provides only limited information.
I would be very much thankful if you could kindly let me know how to get
it..since I am struggling lot getting this.
Thanks
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