Displaying 20 results from an estimated 3000 matches similar to: "R alternative to SAS PROC REPORT"
2008 May 28
5
"rbinom" not using probability of success right
I am trying to simulate a series of ones and zeros (1 or 0) and I am using "rbinom" but realizing that the number of successes expected is not accurate. Any advice out there.
This is the example:
N<-500
status<-rbinom(N, 1, prob = 0.15)
count<-sum(status)
15 percent of 500 should be 75 but what I obtain from the "count" variable is 77 that gives the probability of
2008 Oct 31
4
Help needed with Waterfall plot
Hi friends,
I need suggestions/directions on how to producing a waterfall plot for present extend of change in tumour size for a set of respondents in a study. Example of use of waterfall plot is in the following slides presented at ASCO 2007 by Axel Grothey. Link is
2008 May 19
2
Help on nested FOR loops
I am new to more radical programming in R. I am trying to write a nested 'for' loop to produce output that takes subscripts like:
for i taking values 1,2,3,4,5 and
j taking values 1,2,3
I want to output for a computation using the combination values of i and j a value x like this;
i j x
1 1 x11
1 2 x12
1 3 x13
2 1 x21
2 2 x22
2 3 x23
3 1 x31
3 2 x32
2008 Jun 04
1
"& not meaningful for factors"
I am trying to define groupings from levels of factor variables and this the warning message that R give
"& not meaningful for factors".
The nature of my task is this. I have a variable stage which has the levels (1B, 2A, 2B) - these are the AJCC TNM stages of cancer, and another variable diameter with factor levels ("=< 4", "4 - 6.5, > 6.5; limit values are
2009 Feb 25
1
read multiplan or sylk files in R
Hello,
This may sound crazy, but I have a large number of Multiplan data files I'm in the process of recuperating, and I'm hoping to avoid having to open them one by one to convert them into a modern, directly usable format. So I was wondering if someone somewhere had encountered this and maybe had a way to read Multiplan files in R, or, at least, a way to read SYLK files directly in R.
2008 Sep 05
1
asscii2netcdf]
Dear All,
A friend of mine seeks help in converting the attached ascii to netcdf.
Any assistance will be sincerely appreciated.
Regards,
Marshall
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2008 Jul 01
3
Change name of a specific column of a data frame
Hi,
Sorry for the simple question. Is there a way to change the name of only one
column of an existing data frame?
I know colnames allows you to set the name of all the columns, but only one
column in the middle of my data frame needs a new name.
Thanks,
-Nina
2009 Jul 22
5
Find multiple elements in a vector
Hi,
Given a vector, say
x=sample(0:9,10)
x
[1] 0 6 3 5 1 9 7 4 8 2
I can find the location of an element by
which(x==2)
[1] 10
but what if I want to find the location of more than one number? I could do
c(which(x==2),which(x==3))
but isn't there something more streamlined? My first guess was
y=c(2,3)
which(x==y)
integer(0)
which doesn't work. I haven't found any clue in the R
2005 Dec 15
2
Hmisc latex cell background color
Dear latex/R-Sweavers,
Using the codel below, I can color text in individual cells for latex
output.
Is there a similar way to get a background shading? My attempts failed
because I did not get the closing brace at the right place with Hmisc/latex.
library(Hmisc)
x <- as.data.frame(diag(rnorm(3),nrow=3))
cellTex <- matrix(rep("", NROW(x) * NCOL(x)), nrow=NROW(x))
cellTex[2,2]
2008 Sep 23
3
odds ratio: how to create reference
HI there,
i know this is a basic question, though i need some help because this
is somewhat away from my current issue, but nevertheless interesting
to me... Lets assume i have some estimated probabilities, say
estimated by a logit model. i know i can also state them as an odds
ratio.
Now i?d like to state these odds ratios as a reference to a specific
outcome of my investigated
2005 Apr 26
2
how to modify and compile R sourse codes
Dear All:
I am working on writing some R functions to make statistical reports automatically. Dr. Harrell's Hmisc has all the wonderful stuff. But sometimes I need change some formats, so I want to read through it and make some modifications to fit my project.
Ideally, I want proceed as following:
1. change some source of Hmisc
2. compile and install the modified Hmisc
3. debug my
2008 Jun 27
1
finding the suitable distribution
Dear R-users,
Attach with is my data..what i want to do is finding a suitable distribution for my data..I want to run a few test like the poisson and the exponential distribution. Please help me on how to find the p-value for poisson as well as the exponential distribution without knowing the parameter. Is it possible?? Thanks in advance.
love,
Anisah
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2010 Nov 07
1
varclus in Hmisc vs SAS PROC VARCLUS
Hi,
I'll apreciate your guidance on how can I re-create the output from SAS PROC
VARCLUS in R. I've found the varclus function in Hmisc. However, is it
possible to use that function to compute for each variable the 1-R**2 ratio
(this is the ratio of 1 minus the R-squared with Own Cluster to one minus
the R-squared in the Next Closest cluster)?
Thanks in advance for any help,
Lars.
2011 Apr 14
0
Help converting SAS Proc mixed to R code
To anyone that may be able to help,
First I applogize if this message ends up in your inbox twice. The first
one seemed to get stuck in a pending status so I deleted and started over.
I am relatively new to R, however I know the basics through some classes I
have taken. Unfortunately the classes left off the more complicated
analysis that I need to learn and use. I am attempting to replicate
2004 Mar 30
4
rank() vs SAS proc rank
SAS proc rank has ties options of high and low that would allow
producing ranks of the type found in the sports pages, e.g.,
rank (c(1,1,2,2,2,2,3)) == 1 1 3 3 3 3 7
Could R support these ties.methods?
2010 Sep 05
0
cov.unscaled in NLS - how to define cov.scaled to make comparable to SAS proc NLIN output - and theoretically WHY are they different
I am running a 3-parameter nonlinear fit using the default Gauss-Newton
method of nls.
initialValues.L = list(b=4,d=0.04,t=180);
fit.nls.L = nls(
myModel.nlm ,
fData.L,
start = initialValues.L,
control = nls.control(warnOnly = TRUE),
trace=T
);
summary.nls.L = summary(fit.nls.L);
I run the same analysis in SAS proc NLIN.
proc nlin data=apples outest=a;
parms b=4 d=.04 t=180;
model Y =
2006 Jun 30
0
SAS Proc Mixed and lme
I am trying to use lme to fit a mixed effects model to get the same
results as when using the following SAS code:
proc mixed;
class refseqid probeid probeno end;
model expression=end logpgc / ddfm=satterth;
random probeno probeid / subject=refseqid type=cs;
lsmeans end / diff cl; run;
There are 3 genes (refseqid) which is the large grouping factor, with
2 probeids nested within each refseqid,
2005 Aug 18
1
R equivalent to `estimate' in SAS proc mixed
Example: I have the following model
> model <- lmer(response ~ time * trt * bio + (time|id), data = dat)
where time = time of observation
trt = treatment group (0-no treatment / 1-treated)
bio = biological factor (0-absent / 1-present)
and I would like to obtain an estimate (with standard error) of the change
in response over time for individuals in the
2007 Oct 24
1
is there a similar function to perform repeated statements as in SAS PROC MIXED?
PROC MIXED is used to fit mixed effects model for correlated data.
Usually we can use either a REPEATED statment or a RANDOM statement.
The random statement is corresponding to lme function in R -- specifying a
random effect term.
The repeated statement actually directly specifies the covariance structure
-- is there a similar function in R to do this? I currently want to specify
a unstructured
2007 Dec 10
0
SAS PROC NLMIXED into R
Dear R friends
A while a go I sent an email to the epi-list and later to the help-list and
no answer could fully illuminate my question. So Im trying again with a more
specific matter.
Im trying to work on a script (function) to analyse data from a diagnostic
test meta-analysis with random effects. This was first described by an
author using SAS witn PROC NLMIXED.
Im not an expert in R and much