Displaying 4 results from an estimated 4 matches for "changhong".
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changcheng
2009 Mar 18
3
numeric equality
...== 0.8
[1] TRUE
> a <- 1 - 0.8
> a == 0.2
[1] FALSE
> a <- 1 - 0.5
> a == 0.5
[1] TRUE
> a <- 1 - 0.6
> a == 0.4
[1] TRUE
> a <- 1 - 0.9
> a == 0.1
[1] FALSE
My R version is Windows XP R version 2.8.1 (2008-12-22).
Thanks very much.
Changhong
===================================
P Please consider the environment before printing this e-mail
Cleveland Clinic is ranked one of the top hospitals
in America by U.S. News & World Report (2008).
Visit us online at http://www.clevelandclinic.org for
a complete listing of our services, st...
2008 Dec 11
1
How to generate a prediction equation for a stratified survival model that was fitted by cph() in Design package
...ation based on the saved survival model. But it failed. I
included a stratified variable in the model. If I removed the
stratification, they were working well. Does that mean that function
'Function' doesn't accept a stratified model?
Any thoughts on this will be appreciated. Thanks.
Changhong
===================================
P Please consider the environment before printing this e-mail
Cleveland Clinic is ranked one of the top hospitals
in America by U.S. News & World Report (2008).
Visit us online at http://www.clevelandclinic.org for
a complete listing of our services, sta...
2009 Aug 11
0
how to do model validation and calibration for a model fitted by fit.mult.impute?
...R package Mice. Are there any
functions able to do bootstrapping or cross-validation for the
aggregated model? I tried function 'validate' and 'calibrate' in Design
package, but found they used the last imputed dataset only instead of
all five datasets.
Thanks very much.
Changhong
===================================
P Please consider the environment before printing this e-mail
Cleveland Clinic is ranked one of the top hospitals
in America by U.S. News & World Report (2008).
Visit us online at http://www.clevelandclinic.org for
a complete listing of our services, st...
2008 Mar 27
0
competing risks regression
Dear R users,
I used crr function in R package 'cmprsk' to fit a competing risks
model. There were no any error or
warning messages during running the function, but the output was obvious
not correct.
I saved the model fit as an object called f.crr. I extracted bfitj from
the object by doing f.crr$bfitj, and found
values of bfitj were extremely large (around 1e+138). I tried all