Displaying 20 results from an estimated 20 matches for "urolog".
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2011 Jun 20
2
Error of Cross Validation
...fito<-lrm(y~x)
preo<-predict(fito)
pre<-matrix(NA,nrow=100,ncol=200)
for (i in 1:200)
{
sam<-sample(1:nrow(dat))
sam<-split(sam,1:10)
for (j in 1:10)
{
fit<-lrm(y~x,data=dat[-sam[[j]],])
pre[sam[[j]],i]<-predict(fit,data=dat[sam[[j]],])
}
}
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2009 Sep 12
2
could not find function "Varcov" after upgrade of R?
After upgrading R to 2.9.2, I can't use the anova() fuction.
It says "could not find function "Varcov" ".
What's wrong with my computer? Help needed, thanks!
Yao Zhu
Department of Urology
Fudan University Shanghai Cancer Center
No. 270 Dongan Road, Shanghai, China
[[alternative HTML version deleted]]
2011 Sep 01
1
How to retrieve bias-corrected probability from calibrate.rms
Dear R users:
In Prof. Harrell's library rms, calibrate.rms plot the Bias-corrected
Probability and Apparent Probability.
The latter one can be retrieved from class calibrate.default. But how to
retrieve the former one.
BW
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2009 Jul 26
1
How to add 95% confidence intervals in the calibration plot?
...t book. But I did not quite understand.
I have two problems about the validation and calibration of prediction
models:
1. Can someone explain the results outputted by the validate() function? How
to get 95% of c-value of validate?
2. How to add 95% ci in the calibration plot?
Yao Zhu
Department of Urology
Fudan University Shanghai Cancer Center
[[alternative HTML version deleted]]
2010 Jun 21
1
Is there a similar R function like "stpower" in STATA
Dear R users:
In stat, there is a "stpower" function for power analysis and sample-size
determination in survival
models. Is there a counterpart in R?
Thanks
Yao Zhu
Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China
[[alternative HTML version deleted]]
2011 Jul 15
1
validate survival with val.surv
Dear R users:
I want to externally validate a model with val.surv.
Can I use only calculated survival (at 1 year) and actual survival?
Or I needed the survival function and actual survival.
Thanks
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2013 Feb 11
1
how to plot growth chart like this
Dear R-users
I want to generate a growth chart like this:
http://php.med.unsw.edu.au/embryology/images/9/9a/WHO-XX_length_birth_to_2_years.png
can you give some suggestions about the functions I should use?
Thanks
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2010 Jan 21
3
cross validation function translated from stata
...git `event' `predictors2' if set~=`j'
quietly predict ptemp if set==`j'
quietly replace `prediction2' = ptemp if set==`j'
drop ptemp
}
I don't understand what's the difference between prediction1 and
prediction2
3. Is my code right?
Thanks !
Yao Zhu
Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China
[[alternative HTML version deleted]]
2011 Apr 22
2
How to answer the question about transitive correlation?
...expression was strongly correlated with B expression (chi-square)
in this series. Prior reports by the same authors showed that B expression
strongly correlated with survival (Log-rank). Please provide an explanation
why then were the results not transitive.
Thanks a lot.
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2011 May 08
1
question about val.surv in R
...[[fit$dist]] :
attempt to select less than one element
Could some one explain for me?
Error in survreg.distributions[[fit$dist]] :
attempt to select less than one element
Error in survreg.distributions[[fit$dist]] :
attempt to select less than one element
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2011 May 01
1
Different results of coefficients by packages penalized and glmnet
...binomial",nfolds=5)
plot(cvglmnet)
cvglmnet$lambda.min
which(cvglmnet$lambda==cvglmnet$lambda.min)
glmn.fit2<-glmnet(x=factors,y=HRLNM,family="binomial",lambda=cvglmnet$lambda.min)
coef(glmn.fit2)
Thanks a lot
btw: how to calculate the C.I. of coefs?
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2010 Dec 09
1
error in lrm( )
Dear Sir or Madam?
I am a doctor of urology,and I am engaged in developing a nomogram of bladder cancer. May I ask for your help on below issue?
I set up a dataset which include 317 cases. I got the Binary Logistic Regression model by SPSS.And then I try to reconstruct the model
?lrm(RECU~Complication+T.Num+T.Grade+Year+TS)? by R-Proje...
2010 Oct 13
1
bootstrap in pROC package
...seRs:
I use pROC package to compute the bootstrap C.I. of AUC.
The command was as follows:
roc1<-roc(all$D,all$pre,ci=TRUE,boot.n=200)
However, the result was:
Area under the curve: 0.5903
95% CI: 0.479-0.7016 (DeLong)
Why the C.I. was computed by the Delong Method?
Yao Zhu
Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China
[[alternative HTML version deleted]]
2011 Feb 26
2
tansformation of variables in cph from rms package
...ollows:
fit<-cph(pfsurv~log10(x1)+log10(x2),x=T,y=T,surv=T)
after I run the nomogram function.
I found "variable limits and transformations are such that an infinite axis
value has resulted."
How to add variable limits in the nomogram function?
Thanks a lot
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2011 Jun 04
1
nonparametric logistic regression based on locally weighted scatterplot smoothing (lowess)
...t;http://jco.ascopubs.org/content/27/18/2931.long#ref-11>
Could someone explain nonparametric logistic regression based on locally
weighted scatterplot smoothing (lowess)?
Or it is nonparametric regression based on locally weighted scatterplot
smoothing (lowess)
Thanks
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2011 Oct 10
0
how to extent the improveProb for survival data
Dear R users
Function improveProb in the rms library calculate NRI and IDI for
predictions of binary outcome.
Do anyone extent its use in survival data?
Many thanks.
*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*
[[alternative HTML version deleted]]
2002 Feb 21
0
ADSI in wine
...good.
err:win32:do_relocations Forced to relocate system DLL (base > 2GB). This is
not good.
>>> ldapNameSpace = adsNameSpaces.getobject("", "LDAP:")
>>> ldapCont =
ldapNameSpace.OpenDSObject("LDAP://uhgexchange00/cn=MRRoach,cn=Corporate
Office,ou=UHG,o=Urology Healthcare Group", "cn=myusername,dc=uhg",
"mypassword", 0)
>>> ldapCont.Getinfo()
wine: Unhandled exception, starting debugger...
2006 Jul 11
1
[Fwd: NDN: Samba PDC With LDAP Backend, Failed to initialise SAM_ACCOUNT for us]
...e..
Zach
- -------- Original Message --------
Subject: NDN: [Samba] Samba PDC With LDAP Backend, Failed to initialise
SAM_ACCOUNT for us
Date: Tue, 11 Jul 2006 12:54:51 -0500
From: Gateway
To: zdennis <zdennis@mktec.com>
Sorry. Your message could not be delivered to:
samba,Arkansas Urology (The name was not found at the remote site. Check
that the name has been entered correctly.)
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Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org
iD8DBQFEs/LHMyx0fW1d8G0RAumEAJ9qGddObh6z6ijY3Qc1ZKVwONz6dACeO5Hu
KCYRXccz...
2011 Aug 01
2
How to make a nomogam and Calibration plot
Dear R users,
I am a new R user and something stops me when I try to write a academic
article. I want to make a nomogram to predict the risk of prostate cancer
(PCa) using several factors which have been selected from the Logistic
regression run under the SPSS. Always, a calibration plot is needed to
validate the prediction accuracy of the nomogram.
However, I tried many times and read a lot of
2010 Oct 15
0
nomianl response model
...seRs:
I use pROC package to compute the bootstrap C.I. of AUC.
The command was as follows:
roc1<-roc(all$D,all$pre,ci=TRUE,boot.n=200)
However, the result was:
Area under the curve: 0.5903
95% CI: 0.479-0.7016 (DeLong)
Why the C.I. was computed by the Delong Method?
Yao Zhu
Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China
[[alternative HTML version deleted]]
------------------------------
Message: 31
Date: Wed, 13 Oct 2010 10:23:57 -0300
From: Henrique Dallazuanna <wwwhsd at gmail.com>
To: dpender <d.pender at civil.gla.ac.uk>
Cc: r-help at r...