Displaying 20 results from an estimated 1000 matches similar to: "Please Help pairwise.t.test!!"
2009 Sep 08
2
strange results in summary and IQR functions
Dear R users,
Something is strange in summary and IQR. Suppose, I have a data set and I
would like to find the Q1, Q2, Q3 and IQR.
x<-c(2,4,11,12,13,15,31,31,37,47)
> summary(x)
Min. 1st Qu. Median Mean 3rd Qu. Max.
2.00 11.25 14.00 20.30 31.00 47.00
> IQR(x)
[1] 19.75
However, I test the same data set in SAS "proc univariate", and SAS shows
that
2009 Sep 29
4
Something wrong with my function Please Help
Hi R users,
I try to build a function to compute odds ratio and relative risk however
something wrong. I stuck for many hours but I really don't know how to solve
it. Would someone please give me a hint?
> OR.RR<-function(x){
+ x <- as.matrix(any(dim(x)==2))
+ OR<-(x[1,1]*x[2,2])/(x[1,2]*x[2,1])
+ RR<-(x[1,1]/(sum(x[1,])))/(x[2,1]/(sum(x[2,])))
+
2010 Feb 23
3
Use 2 "ifelse" to sort data
Dear R users,
I have a question how to use 2 "ifelse" to sort my data. Such as
from 11 to 20 assign to A; 6 to 10 assign to B, and the rest of them assign
to C
a<-1:20
tt<-ifelse(a>10, "A",no=ifelse( 5< a <=10, "B", "C"))
Many Thanks
Chunhao
--
View this message in context:
2008 Jul 30
2
Repeated Measure ANOVA-Old question
Hi R users,
I google the website and I found that there are three ways to perform
repeated measure ANOVA: aov, lme and lmer.
http://www.mail-archive.com/r-help at stat.math.ethz.ch/msg58502.html
But the questions are which one is good to use and how to do post-hoc test?
I use the example that is provided in the above link and I try
> tt<-aov(p.pa~group*time+Error(subject/time),data=P.PA)
2009 Feb 24
1
Help How to use a loop to do pair comparison
Hi R users,
I have a question. How can I use for loop to do pair comparisons. For
example,
> x<-c(1,2,3)
> result<-matrix(data=NA, nrow=choose(3,2), ncol=1)
> for(i in 1: length(x))
+ { result[i,]<-ifelse(x[i] > x[i+1], yes="Big", no="Small")
+ result}
> result
[,1]
[1,] "Small"
[2,] "Small"
[3,] NA
2008 Sep 06
1
Help use try function with boot
Hi R users,
Is is possible for me to use the try function with boot? I would to do
the bootstraping with a nonlinear model(it works well when R < 1000).
But it does not work very well (when R is large) thus I try to use
"try" to resolve. I put the try function in two cases:
case1: put the try in front of the boot
> c1.try<-try(boot(c1data, statistic = c1.fun,
2008 Sep 24
2
Bug in "is" ?
Hi R users
Is there anything wrong in "is" function? (R 2.7.2)
I believe that everyone will agree that "7" is an integer, right? but
why R shows 7 is not an integer
> is.integer(7)
[1] FALSE
> is(7,"integer")
[1] FALSE
> is(as.integer(7), "integer")
[1] TRUE
Thank you very much in advance
Chunhao
2008 Sep 24
2
Bug in "is" ?
Hi R users
Is there anything wrong in "is" function? (R 2.7.2)
I believe that everyone will agree that "7" is an integer, right? but
why R shows 7 is not an integer
> is.integer(7)
[1] FALSE
> is(7,"integer")
[1] FALSE
> is(as.integer(7), "integer")
[1] TRUE
Thank you very much in advance
Chunhao
2008 Sep 02
1
correlation with boot
Hi R users,
I have one simple question but I really don't know why I can't get it work.
The data was adopted from Efron's An introduction to the bootstrap book.
> nlaw
LSAT GPA
[1,] 576 3.39
[2,] 635 3.30
[3,] 558 2.81
[4,] 578 3.03
[5,] 666 3.44
[6,] 580 3.07
[7,] 555 3.00
[8,] 661 3.43
[9,] 651 3.36
[10,] 605 3.13
[11,] 653 3.12
[12,] 575 2.74
2008 Sep 09
1
S.O.S "try" doesnot work in boot?
First thanks for Jinsong's suggestions
I would like to do a bootstrap in a nonlinear model. But it fails to
converge in most of time. (it did converge if I just use nls without
boot). Thus, I use "try" function to resolve my problem. This
following code is from Jinsong's suggestion.
h1a.nls<-nls(density~nmf(time, alpha, delta, psi, tau, gamma),data=h1a,
2009 Dec 02
4
Finding cases in one subset that are closet to another subset
Good afternoon
Running R2.10.0 on Windows
I have a data frame that includes (among much else) a factor (In_2006) and a continuous variable (math_3_4). I would like to find the 2 cases for In_2006 = 0 that are closest to each case where In_2006 = 1.
My data looks like
In_2006 math_3_4
0 55.1
1 51.6
1 18.1
1 26.6
1 14.1
2006 Sep 20
5
multiple lines and plot
Hi. Please, how can I put together 2 or more lines at the same
scatterplot ? Example: measures of protein intake (quantitative) of 4
children over 30 days, by day. How to plot all children at same graphic:
Protein X Time ? Is there any command like "overlay" ?
Thank you,
Mauricio
2008 Jun 10
7
[Trivia question] What engine is it on DTrace T-shirt ?
Hi,
This is not a DTrace technical question (so, please don''t flame me for
it) :)
This is regarding the DTrace (un)conference TShirt.
I am curious to know what engine is it. Could not figure it out.
Thanks and regards,
Sanjeev.
--
Solaris Revenue Products Engineering,
India Engineering Center,
Sun Microsystems India Pvt Ltd.
Tel: x27521 +91 80 669 27521
2012 Jul 11
3
unable to subtract dates in R
Hi,
I wanted to calculate the age of people in my dataset by subtracting the
individual's date of birth from their intake into a program.
After several hours, searches of help archives, and the downloading of
lubiridate, I have had no luck with this.
Below is the code I used.
> intakeDS$DOB <- as.character(intakeDS$DOB)
> intakeDS$DOB <- as.Date(intakeDS$DOB,
2009 Jun 14
6
a proposal regarding documentation
Proposal
That a new mailing list be established
that pertains exclusively to R documentation.
The purpose of the list would be to discuss
weak sections of the documentation and
establish fixes for those weak spots.
Pro
If it works, there would be better documentation.
It would be an excellent opportunity for newish
and/or less technical people to contribute to R.
In some respects such people
2009 Oct 21
3
Missing data and LME models and diagnostic plots
Hello
Running R2.9.2 on Windows XP
I am puzzled by the performance of LME in situations where there are missing data. As I understand it, one of the strengths of this sort of model is how well it deals with missing data, yet lme requires nonmissing data.
Thus,
m1.mod1 <- lme(fixed = math_1 ~ I(year-2007.5)*TFC_,
data = long,
random =
2009 Nov 02
7
qqplot
Hi,
We could use qqplot to see how two distributions are different from each other. To show better how they are different (departs from the straight line), how is it possible to plot the straight line that goes through them? I am looking for some thing like qqline for qqnorm. I thought of abline but how to determine the slope and intercept?
Best wishes,
Carol
2016 Mar 31
2
Asterisk 13 - Call Bridge issue.
I have the following senerio.
Call file calls 1st party.
When connected give called party option to connect to second party.
Issue Dial to second party. Caller answers and the two are bridged
together.
My issue is that 4 out of 5 calls fail to bridge the audio.
Am I missing something or is there some kind of bug? Here is my test
dialplan
;Dialer Base Code Files.
;Variables
2009 Oct 21
1
Question on mixed effect models with LME
Good afternoon
Using R 2.9.2 on a machine running Windows XP
I have a longitudinal data set, with data on schools and their test scores over a four year period. I have centered year, and run the following
m1.mod1 <- lme(fixed = math_1 ~ I(year-2007.5)*TFC_,
data = long,
random = ~I(year-2007.5)|schoolnum,
na.action = "na.omit")
where
2008 Apr 04
2
pairwise.t.test for paired data
Dear R-help, I have a question about pairwise.t.test and adjustment for
multiple comparisons for paired data points.
I have the following data:
n=c("x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "y", "y",
"y", "y", "y", "y",