Displaying 20 results from an estimated 100 matches similar to: "Difference between R and SAS in Corcordance index in ordinal logistic regression"
2010 Jul 23
2
glm - prediction of a factor with several levels
Dear community,
I'm currently attempting to predict the occurence of an event (factor)
having more than 2 levels with several continuous predictors. The model
being ordinal, I was waiting the glm function to return several intercepts,
which is not the case when looking to my results (I only have one
intercept). I finally managed to perform an ordinal polytomous logisitc
regression with the
2010 Sep 06
3
likelyhood maximization problem with polr
Dear community,
I am currently trying to fit an ordinal logistic regression model with the
polr function. I often get the same error message :
"attempt to find suitable starting values failed", for example with :
require(MASS)
data(iris)
polr(Species~Sepal.Length+Sepal.Width+Petal.Length+Petal.Width,iris)
(I know the response variable Species should be nominal but I do as levels
2010 Nov 03
2
bugs and misfeatures in polr(MASS).... fixed!
In polr.R the (several) functions gmin and fmin contain the code
> theta <- beta[pc + 1L:q]
> gamm <- c(-100, cumsum(c(theta[1L], exp(theta[-1L]))), 100)
That's bad. There's no reason to suppose beta[pc+1L] is larger than
-100 or that the cumulative sum is smaller than 100. For practical
datasets those assumptions are frequently violated, causing the
2005 Feb 04
2
no. at risk in survfit()
Hi,
when I generated a survfit() object, I can get number
of patients at risk at various time points by using
summary():
fit<-survfit(Surv(time,status)~class,data=mtdata)
summary(fit)
class=1
time n.risk n.event survival std.err lower 95% CI
upper 95% CI
9.9 78 1 0.987 0.0127 0.963 1
41.5 77 1 0.974 0.0179 0.940 1
54.0 76
2018 May 31
2
mysterious rounding digits output
Well pointed out, Jim!
It is infortunate that the documentation for options(digits=...)
does not mention that these are *significant digits* and not
*decimal places* (which is what Joshua seems to want):
"?digits?: controls the number of digits to print when
printing numeric values."
On the face of it, printing the value "0,517" of 'ccc' looks
like printing 4
2018 May 31
3
mysterious rounding digits output
R version 3.5.0 (2018-04-23) -- "Joy in Playing"
Platform: x86_64-pc-linux-gnu (64-bit)
options(digits=3)
itemInfo <- structure(list("aaa" = c(1.39633732316667, 1.32598263816667, 1.11658324066667, 1.23651072616667, 1.05368679983333, 1.03100737383333, 0.9630728395, 0.7483865045, 0.620086646166667, 0.5411017985, 0.496397607833333, 0.459528044666667, 0.427877047833333,
2018 May 31
0
mysterious rounding digits output
Hi Joshua,
Because there are no values in column ddd less than 1.
itemInfo[3,"ddd"]<-0.3645372
itemInfo
aaa bbb ccc ddd eee
skill 1.396 6.225 0.517 5.775 2.497
predict 1.326 5.230 0.462 5.116 -2.673
waiting 1.117 4.948 NA 0.365 NA
complex 1.237 4.170 0.220 4.713 5.642
novelty 1.054 4.005 0.442 4.260 2.076
creative 1.031 3.561 0.362 3.689
2018 May 31
0
mysterious rounding digits output
>>>>> Ted Harding
>>>>> on Thu, 31 May 2018 07:10:32 +0100 writes:
> Well pointed out, Jim!
> It is infortunate that the documentation for options(digits=...)
> does not mention that these are *significant digits*
> and not *decimal places* (which is what Joshua seems to want):
Since R 3.4.0 the help on ?options *does* say
2008 Sep 03
1
R puts '+' within my numbers
Hello,
my test.R file contains two huge arrays (>3000 entries), from which R needs to calculate the Pearson Correlation, if I look at the file the numbers look correct.
if I run R
R < test.R --no-save
I see things like this:
0.723, 0.838, 1.002, 0.364, 0.357, 0.227, 0.982+ , 0.963, 0.535, 1.214, 1.270, 0.832, 1.033, 0.632, 2.482, 1.239, 0.743, 1.077, 0.962, 1.052, 1.075, 1.427, 1.395,
2008 Sep 05
1
Plot by column
Dear list,
I have the following matrix. How can I make the following plot?
1. The x-axis has index 1:7, and the first column is plotted against index 1, second against 2, and so on.
2. I want the points from the left upper conner including the antidiagonal to be plotted with col=2, and the rest with col=3
[,1] [,2] [,3] [,4] [,5] [,6] [,7]
[1,] 0.589 0.857 0.923 0.944 0.954 0.963
2008 Aug 28
1
abline of an lm fit not correct
mac osx 10.5.4
R 2.7.1
I have fit a model
d<-lm(y~x)
with an R^2 of 0.963
but when I issue the command
abline(d)
the line is below where it ought to be. Looks like the right slope,
but not the right intercept.
thanks
--
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy
Let's not spend our time and resources thinking about things that are
so little or so large
2009 Oct 16
1
Frequencies, proportions & cumulative proportions
Dear R-Helpers,
I've looked high and low for a function that provides frequencies,
proportions and cumulative proportions side-by-side. Below is the table
I need. Is there a function that already does it?
Thanks,
Bob
> # Generate some test scores
> myValues <- c(70:95)
> Score <- ( sample( myValues, size=1000, replace=TRUE) )
> head(Score)
[1] 77 71 81 88 83 93
>
>
2011 Jun 22
1
caret's Kappa for categorical resampling
Hello,
When evaluating different learning methods for a categorization problem with
the (really useful!) caret package, I'm getting confusing results from the
Kappa computation. The data is about 20,000 rows and a few dozen columns,
and the categories are quite asymmetrical, 4.1% in one category and 95.9% in
the other. When I train a ctree model as:
model <- train(dat.dts,
2003 Apr 10
1
Classification problem - rpart
I am performing a binary classification using a classification tree.
Ironically, the data themselves are 2483 tree (real biological ones)
locations as described by a suite of environmental variables (slope, soil
moisture, radiation load, etc). I want to separate them from an equal number
of random points. Doing eda on the data shows that there is substantial
difference between the tree and random
2001 Sep 07
3
fitting models with gnls
Dear R-list members,
Some months ago I wrote a message on the usage of gnls (nlme library) and here I come again.
Let me give an example:
I have a 10 year length-at-age data set of 10 fishes (see growth.dat at the end of this message) and I want to fit a von Bertalanffy growth model, Li= Linf*(1-exp(-k*(ti-t0))) where Li = length at age i, Linf= asymptotic length, k= curvature parameter, ti=
2006 May 15
1
anova statistics in lmer
Dear list members,
I am new to R and to the R-help list. I am trying to perform a
mixed-model analysis using the lmer() function. I have a problem with
the output anova table when using the anova() function on the lmer
output object: I only get the numerator d.f., the sum of squares and the
mean squares, but not the denominator d.f., F statistics and P values.
Below is a sample output, following
2008 Aug 08
2
aggregate
Dear All-
I have a dataset that is comprised of the following:
doy yr mon day hr hgt1 hgt2 hgt3 co21 co22 co23 sig1 sig2 sig3 dif flag
244.02083 2005 09 01 00 2.6 9.5 17.8 375.665 373.737 373.227 3.698 1.107
0.963 -0.509 PRE
244.0625 2005 09 01 01 2.6 9.5 17.8 393.66 384.773 379.466 15.336 11.033
5.76 -5.307 PRE
244.10417 2005 09 01 02 2.6 9.5 17.8 411.162 397.866 387.755 6.835 5.61
6.728
2019 Jul 23
2
[PATCH] virtio-net: parameterize min ring num_free for virtio receive
On 2019/7/20 0:13, Michael S. Tsirkin wrote:
> On Fri, Jul 19, 2019 at 03:31:29PM +0000, ? jiang wrote:
>> On 2019/7/19 22:29, Jiang wrote:
>>> On 2019/7/19 10:36, Jason Wang wrote:
>>>> On 2019/7/18 ??10:43, Michael S. Tsirkin wrote:
>>>>> On Thu, Jul 18, 2019 at 10:42:47AM -0400, Michael S. Tsirkin wrote:
>>>>>> On Thu, Jul 18, 2019
2019 Jul 23
2
[PATCH] virtio-net: parameterize min ring num_free for virtio receive
On 2019/7/20 0:13, Michael S. Tsirkin wrote:
> On Fri, Jul 19, 2019 at 03:31:29PM +0000, ? jiang wrote:
>> On 2019/7/19 22:29, Jiang wrote:
>>> On 2019/7/19 10:36, Jason Wang wrote:
>>>> On 2019/7/18 ??10:43, Michael S. Tsirkin wrote:
>>>>> On Thu, Jul 18, 2019 at 10:42:47AM -0400, Michael S. Tsirkin wrote:
>>>>>> On Thu, Jul 18, 2019
2019 Jul 19
1
[PATCH] virtio-net: parameterize min ring num_free for virtio receive
On 2019/7/19 22:29, Jiang wrote:
>
> On 2019/7/19 10:36, Jason Wang wrote:
>>
>> On 2019/7/18 ??10:43, Michael S. Tsirkin wrote:
>>> On Thu, Jul 18, 2019 at 10:42:47AM -0400, Michael S. Tsirkin wrote:
>>>> On Thu, Jul 18, 2019 at 10:01:05PM +0800, Jason Wang wrote:
>>>>> On 2019/7/18 ??9:04, Michael S. Tsirkin wrote:
>>>>>> On