Displaying 20 results from an estimated 140 matches similar to: "logistic regression - what is being predicted when using predict - probabilities or odds?"
2008 Apr 12
2
Predict Function
Hi all - my first time here and am having an issue with the Predict function.
I am using a tutorial as a guide, locate here:
http://www.ats.ucla.edu/STAT/R/dae/mlogit.htm
My code gives this error
> newdata1$predicted <- predict(mlogit,newdata=newdata1,type="response")
Error in `$<-.data.frame`(`*tmp*`, "predicted", value = c(0.332822934960197,
:
replacement has
2013 May 21
1
keep the centre fixed in K-means clustering
Dear R users
I have the matrix of the centres of some clusters, e.g. 20 clusters each
with 100 dimentions, so this matrix contains 20 rows * 100 columns numeric
values.
I have collected new data (each with 100 numeric values) and would like to
keep the above 20 centres fixed/'unmoved' whilst just see how my new data
fit in this grouping system, e.g. if the data is close to cluster 1
2013 Apr 03
1
linear model coefficients by year and industry, fitted values, residuals, panel data
Hi R-helpers,
My real data is a panel (unbalanced and with gaps in years) of thousands of firms, by year and industry, and with financial information (variables X, Y, Z, for example), the number of firms by year and industry is not always equal, the number of years by industry is not always equal.
#reproducible example
firm1<-sort(rep(1:10,5),decreasing=F)
year1<-rep(2000:2004,10)
2008 Jun 15
2
How to take the average of multiple rows
Dear all,
I have a matrix, called newdata1,
> dim(newdata1)
[1] 34176 83
It looks like:
EntrezID Name S1 S2 S3 S4 S5.....
1 4076 CAPRIN1 0.1 0.2 0.3...
2 139170 WDR40B 0.4 0.5 0.6...
3 5505 PPP1R2P1 0.3 0.3 0.7...
4 4076 CAPRIN1 0.7 0.3 0.2...
5 139170 WDR40B null 0.8
2008 Oct 23
0
error when using logistic.display within a loop
Dear list,
I tried to apply the logistic regression to different response variables from a dataframe and would like to store the results using the function logistic.display from the "epicalc" package in a list, but got an error message "Error in eval(expr, envir, enclos) : y values must be 0 <= y <= 1". All the response variables have value of 0 or 1. It worked
2012 Dec 12
2
help with predict.glm, and charting with factors
Dear R Wizards,
After much frustration and days of confusion I have finally broken down and
am asking for help, which I don’t like doing, but I just can’t figure this
one out on my own. I’ve conducted a laboratory experiment testing the
effects of temperature and salinity on whether or not a biological event
will occur (Go or NoGo). I’ve coded the factors temperature and salinity
as factors for
2011 Sep 27
0
Keep consecutive year observations (remove gap's) in panel data (dataframes). Difficulties in using lag(). Package plm.
Hi everyone.
I have two questions. I’ve found some other questions and answers similar to
these but they didn’t solve my problem.
I’m working with a panel of firm/years observations (see my reproducible
example). I’m using the plm package.
My panel not only is unbalanced but also have some gap’s in years.
#reproducible example
2008 Jun 14
1
how to select out some columns using cbind()
Hello! I have a matrix:
> dim(data1)
[1] 34176 581
of 34176 rows and 581 columns,
I want to make a new matrix data2 by taking the 2nd column, 9th column, 16th
column....
the column number is in the order of:
2
9 (2+7)
16 (9+7)
23 (16+7)
...
the new matrix data2 should include 83 columns, is there an easy way to
do that using cbind() function?
Thanks a lot!
Allen
[[alternative HTML
2008 Mar 10
0
Proportional odds ordinal logistic regression models with random effects
I am trying to incorporate random effects (random intercept is good enough)
to a proportional odds logistic regression model for ordinal outcomes.
Could lme4 do this? I'd appreciate any input.
Hakan Demirtas
2006 Jun 06
0
Score test to evalutate the proportional odds assumption.
To the list:
What R commands will perform the score test on an ordered multinomial
logit model to evaluate the proportional odds assumption?
Many thanks.
Mtichell Wachtel
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2011 Nov 12
2
Odds ratios from lrm plot
The code
library(Design)
f <- lrm(y~x1+x2+x1*x2, data=data)
plot(f)
produces a plot of log odds vs x2 with 0.95 confidence intervals. How do I
get a plot of odds ratios vs x2 instead?
Thanks
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2011 Nov 03
0
L1 penalization for proportional odds logistic regression
Dear community,
I am currently attempting to perform a (L1) penalized ordinal logistic
regression with proportional odds. For the moment I only found R packages
allowing to perform forward or backward continuation ratio model with
several penalizations.
Does anyone have a clue of what R package I could use ? I am not even quite
sure that penalized logistic regression with proportional odds has
2005 Jul 15
0
Ordinal data - Regression Trees & Proportional Odds
Dear Dr. Fieberg,
you used a regression tree approach to explore ordinal data set in addition to
the proportinal odds model. I find this very interesting. I would like to know, how good the
results of the regression tree approach turned out in comparison to the
proportional odds model. Since people very often treat ordinal data as continuous, I would
like to know how successfull this strategy
2010 Jun 09
0
non-parametric repeated measures anova using Proportional Odds Model - examples?!
Hello dear R-help mailing list,
I wish to perform a non-parametric repeated measures anova.
If what I read online is true, this could be achieved using a mixed Ordinal
Regression model (a.k.a: Proportional Odds Model).
I found two packages that seems relevant, but couldn't find any vignette on
the subject:
http://cran.r-project.org/web/packages/repolr/
2005 Oct 19
0
mid-p CIs for common odds ratio
mantelhaen.test() gives the exact conditional p-value (for independence) and confidence intervals (CIs)for the common odds ratio for a stratified 2x2 table. The epitools package by Tomas Aragon (available via CRAN) contains functions which use fisher.test() to calculate mid-p exact p-values and CIs for the CMLE odds ratio for a single 2x2 table. The mid-p p-value for independence for a stratified
2009 Feb 24
1
polr (MASS): score test for proportional odds model
For the following model,
library(vcd)
arth.polr <- polr(Improved ~ Sex + Treatment + Age, data=Arthritis)
summary(arth.polr)
where Improved is an ordered, 3-level response I'm looking for a
*simple* way to test
the validity of the proportional odds assumption, typically done via a
score test
for equal slopes/effects over the predictors.
I do find a po.test= option in the repolr package
2011 May 25
0
combined odds ratio
Dear all,
I am looking for an R function which does stepwise selection cox model in r
(delta chisq likelihood ratio test) similar to the stepwise, pe (0.05) lr:
stcox in STATA.
I am very thankful for any reply.
Regards,
Linda
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2005 Jul 26
1
Difficulty getting standard deviation of ALL odds ratios with glm function, logistic regression, need cov of parameters
I am trying to do logistic regression with a categorical predictor variable
with the glm() function, family=binomial. Using glm() I would like to be
able to calculate the confidence intervals of all three possible odds ratios
for a factor (the factor has three categories). Three categories imply two
columns of 0's and 1's in the design matrix, and two parameter estimates
with their
2003 Dec 13
1
partial proportional odds model (PPO)
Hi
Since the 'equal slope' assumption doesn't hold in my data I cannot use
a proportional odds model ('Design' library, together with 'Hmisc'). I
would like to try therefore a partial proportional odds model
Please, could anybody tell me, where to find the code and how to specify
such a model
..or any potential alternatives
many thanks for your kind help
christoph
2016 Apr 15
0
Odds Ratio and OR CI
Please don't post in HTML. Your post is almost unreadable
Also,lease have a look at
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example and/or http://adv-r.had.co.nz/Reproducibility.html for some suggestions about what you should include in your question.
Welcome to R.
John Kane
Kingston ON Canada
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