Displaying 20 results from an estimated 8000 matches similar to: "Logistic Regression in R (SAS -like output)"
2006 Dec 14
3
Stepwise regression
Dear all,
I am wondering why the step() procedure in R has the description 'Select a
formula-based model by AIC'.
I have been using Stata and SPSS and neither package made any reference to
AIC in its stepwise procedure, and I read from an earlier R-Help post that
step() is really the 'usual' way for doing stepwise (R Help post from Prof
Ripley, Fri, 2 Apr 1999 05:06:03
2007 Jun 19
2
BIC and Hosmer-Lemeshow statistic for logistic regression
I haven't find any helpful thread. How can i calculate BIC and
Hosmer-Lemeshow statistic for a logistic regression model. I have used glm
for logistic fit.
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2002 Oct 21
2
More Logistic Regression Tools?
I've been using R to do logistic regresssion, and that's working
well, but there are two things I haven't figured out how to do.
(1) Is there some pre-existing function that will let you compute the
odds ratios and confidence intervals for them for a specific fit. I know
how to do this manually or even write a function that I can call with
the coefficients and se, but
2008 Sep 16
2
Hosmer- Lemeshow test
Dear R - help,
I am working on the Credit scorecard model. I am using the Logistic regression to arrive at the regression coefficients model.
I want to use the Hosmer - Lemeshow test .
In order to understand the use of R - language, I had referred the following URL
http://www.stat.sc.edu/~hitchcock/diseaseoutbreakRexample704.txt
The related data 'diseaseoutbreak' is available
2013 Apr 14
5
Logistic regression
I have a data set to be analyzed using to binary logistic regression. The
data set is iin grouped form. My question is: how I can compute
Hosmer-Lemeshow test and measures like sensitivity and specificity? Any
suggestion will be greatly appreciated.
Thank you
Endy
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2011 May 08
1
Hosmer-Lemeshow 'goodness of fit'
I'm trying to do a Hosmer-Lemeshow 'goodness of fit' test on my logistic
regression model.
I found some code here:
http://sas-and-r.blogspot.com/2010/09/example-87-hosmer-and-lemeshow-goodness.html
The R code is above is a little complicated for me but I'm having trouble
with my answer:
Hosmer-Lemeshow: p=0.6163585
le Cessie and Houwelingen test (Design library): p=0.2843620
2005 Jun 28
1
faster algorithm for Kendall's tau
Hi,
I need to calculate Kendall's tau for large data
vectors (length > 100'000).
Is somebody aware of a faster algorithm or package
function than "cor(, method="kendall")"?
There are ties in the data to be considered (Kendall's
tau-b).
Any suggestions?
Regards
Ferdinand
2008 Sep 25
1
HOW to use the Hosmer–Lemeshow test? in R
i want to know how to use the Hosmer?Lemeshow test? in R. Can anyone show me
the program to me and tell me how to use it?
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2003 Jul 17
1
Hosmer- Lemeshow test
dear all,
i made some analysis with logistic regression. do you know if there is
already a function available for the hosmer-lemeshow fitness test?
thank you very much for the help
best wishes
andi
2005 Sep 13
1
logistic regression with nominal predictors
(Sorry for obvious mistakes, as I am quite a newby with no Statistics
background).
My question is going to be what is the gain of logistic regression over
odds ratios when none of the input variables is continuous.
My experiment:
Outcome: ordinal scale, ``quality'' (QUA=1,2,3)
Predictors: ``segment'' (SEG) and ``stress'' (STR). SEG is
nominal scale with 24
2002 Nov 22
2
hosmer-lemeshow
Hi eveybody.
I've seen posted before the same question, but no answer. Is there anybody
who has implemented the Hosmer-Lemeshow test in R?
TIA,
Stefano
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2006 Sep 12
1
Kendall's tau-c
Hello,
I can't find a package which calculates Kendall's tau-c. There is the
package Kendall, but it only calcuates Kendall's tau-b.
Here is the example from
ttp://www2.chass.ncsu.edu/garson/pa765/assocordinal.htm.
cityriots <- data.frame(citysize=c(1,1,2,2,3,3),
riotsize=c(1,2,1,2,1,2), weight=c(4,2,2,3,0,4))
cityriots <- data.frame(lapply(cityriots,function(x)
2013 Apr 23
1
Hosmer Lemeshow test
Hi to everybody. I use the following routine (i found it in the internet)
to compute the Hosmer-Lemeshow test in the framework of logistic regression.
hosmerlemeshow = function(obj, g=10) {
# first, check to see if we fed in the right kind of object
stopifnot(family(obj)$family=="binomial" && family(obj)$link=="logit")
y = obj$model[[1]]
# the double bracket
2010 Feb 17
1
Checking the assumptions for a proper GLM model
Hello,
Are there any packages/functions available for testing the assumptions
underlying assumptions for a good GLM model? Like linktest in STATA
and smilar. If not, could somebody please describe their work process
when they check the validity of a logit/probit model?
Regards,
Jay
2010 Jul 09
1
Appropriate tests for logistic regression with a continuous predictor variable and Bernoulli response variable
I have a data with binary response variable, repcnd (pregnant or not) and one predictor continuous variable, svl (body size) as shown below. I did Hosmer-Lemeshow test as a goodness of fit (as suggested by a kind “R-helper” previously). To test whether the predictor (svl, or body size) has significant effect on predicting whether or not a female snake is pregnant, I used the differences between
2012 Nov 27
1
Concordant und Discordant Paars of Logistic Regression
Hallo there,
can anymore show me how to get results about konkordant und diskordant paars (Sommer-D, Gudman-Krustal-Gama, Kendall-Tau-a) within a logistic regression) in R?
Thanks a lot.
MT
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2013 Jan 24
4
Difference between R and SAS in Corcordance index in ordinal logistic regression
lrm does some binning to make the calculations faster. The exact calculation
is obtained by running
f <- lrm(...)
rcorr.cens(predict(f), DA), which results in:
C Index Dxy S.D. n missing
0.96814404 0.93628809 0.03808336 32.00000000 0.00000000
uncensored Relevant Pairs Concordant Uncertain
32.00000000
2005 Aug 13
1
R/S-Plus/SAS yield different results for Kendall-tau and Spearman nonparametric regression
Colleagues,
I ran some nonparametric regressions in R (run in RedHat Linux), then
a colleague repeated the analyses in SAS. When we obtained different
results, I tested S-Plus (same Linux box). And, got yet different
results. I replicated the results with a small dataset:
DATA:
37.5
23
37.5
13
25
16
25
12
100
15
12.5
19
50
20
100
13
100
10
100
10
100
16
50
10
87.5
2008 Nov 07
1
two kind of Hosmer and Lemeshow’s test
I know that there are two method to apply the Hosmer and Lemeshow?s. One of
them is calculated based on the fixed and pre-determined cut-off points of
the estimated probability of success. One of them is calculated based on
the percentiles of estimated probabilities.
In the previous post,i find that the Hosmer and Lemeshow?s test how to use
in R.
hosmerlem <-
function (y, yhat, g = 10)
{
2007 Jul 26
2
logistic regression
Greetings,
I am working on a logistic regression model in R and I am struggling with the code, as it is a relatively new program for me. In searching Google for 'logistic regression diagnostics' I came Elizabeth Brown's Lecture 14 from her Winter 2004 Biostatistics 515 course (http://courses.washington.edu/b515/l14.pdf) . I found most of the code to be very helpful, but I am