Displaying 20 results from an estimated 2000 matches similar to: "Averaging rows if a condition is true."
2010 Jan 25
3
binary
Hi all
Assume I have a data set xx;
Group: 1=group1 ?, 2=group2
IQ: ?1= High, 0 =low
fit <- glm(IQ ~group, data = xx, family = binomial())
summary(fit)
Results
?????? ????????????Estimate Std. Error z value Pr(>|z|)
(Intercept) -2.55456??? 0.210 -12.273? < 5e-16 ***
group????????? 0.36180 ?????0.076?? 3.952 ????5.24e-05 ***
the odd ratio = exp(0.36180 )= 1.435912
My question
2009 Sep 09
2
How to sum and group data by DATE in data frame
Dear all,
Lets say I have a data frame as follows:
> Date <- as.Date(c('2006-08-23', '2006-08-30', '2006-09-06', '2006-09-13', '2006-09-20'))
> Income <- c(73.79, 72.46, 76.32, 72.43, 72.62)
> data.frame(Date, Income)
Date Income
1 2006-08-23 73.79
2 2006-08-30 72.46
3 2006-09-06 76.32
4 2006-09-13 72.43
5 2006-09-20 72.62
>
2010 May 05
2
t.test per line
Dear All,
I apologize for this trivial question, I can not find the solution
I try to use t.test function per line in the data.frame, But i
dont'understand the error message
my program is as follows
group1<-gl(2,20)
fun<-function(x){
m<-data.frame(group1,x)
#anova(aov(x ~ group1, m))
t.est(x ~ group1,m)
}
ttest<- apply(data, 1, fun)
Error in t.test.default(x = c(1, 1,
2013 Mar 15
3
reviewer comment
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2009 Nov 11
2
Error in lm() function
Hi all,
I wanted to have a seasonality study like whether a particular month has
significant effect as compared to others. Here is my data :
0.10499 0 0 1 0 0 0 0 0 0 0 0
0.00259 0 0 0 1 0 0 0 0 0 0 0
-0.06015 0 0 0 0 1 0 0 0 0 0 0
0.10721 0 0 0 0 0 1 0 0 0 0 0
0.03597 0 0 0 0 0 0 1 0 0 0 0
0.10584 0 0 0 0 0 0 0 1 0 0 0
0.02063 0 0 0 0 0 0 0 0 1 0 0
-0.03509 0 0 0 0 0 0 0 0 0 1 0
-0.03485 0 0 0
2009 Aug 26
4
Select top three values from data frame
Hi,
I'm trying to find an easy way to do this.
I want to select the top three values of a specific column in a subset
of rows in a data.frame. I'll demonstrate.
A B C
x 2 1
x 4 1
x 3 2
y 1 5
y 2 6
y 3 8
I want the top 3 values of B from the data.frame where A=X and C <2
I could extract all the rows where C<2, then sort by B, then take
2010 Apr 30
3
Find solution for an error in the condition of if
Dear r-help,
Could you help me to find a solution for this error:
Il y a eu 50 avis ou plus (utilisez warnings() pour voir les 50 premiers)
> warnings()
Messages d'avis :
1: In if ((data[pa, k] == df[, j]) & (data[ch, k] == i)) { ... :
la condition a une longueur > 1 et seul le premier élément est utilisé
2: In if ((data[pa, k] == df[, j]) & (data[ch, k] == i)) { ... :
la
2010 May 25
4
R eat my data
HI, Dear R community,
My original file has 1932 lines, but when I read into R, it changed to 1068
lines, how comes?
cdu@nuuk:~/operon$ wc -l id_name_gh5.txt
1932 id_name_gh5.txt
> gene_name<-read.table("/home/cdu/operon/id_name_gh5.txt", sep="\t",
skip=0, header=F, fill=T)
> dim(gene_name)
[1] 1068 3
--
Sincerely,
Changbin
--
Changbin Du
DOE Joint Genome
2010 Feb 17
2
Is the aggregate function the best way to do this?
Hi,
I''m having a dataframe ''Subset1'' with a number of factor variables and 160
numerical variables
Now I want to make sums for all rows that have the same values for the
different factor variables, except for the factor variables: VAR1,VAR2,VAR3
who may have the same values.
With the formula given below this works great, but in a situation with 15000
rows and 13
2011 May 25
1
transpose ?
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2008 Jul 15
2
Problem installing R on openSUSE 10.3
Dear All,
I am trying to install R 2.7 on my openSUSE 10.3. I have faithfully followed instruction at http://cran.r-project.org/bin/linux/suse/ReadMe.txt. I have downloaded all the RPMs but still R complains about:
libtcl8.4.so is needed by R-base-2.7.1-6.1.i586
I searched for this library and found a one, tcl-8.4.15-22.i586.rpm at openSUSE distribution site and installed. But R still complains
2010 Apr 14
6
sum specific rows in a data frame
I have a data frame called "pose":
DESCRIPTION QUANITY CLOSING.PRICE
1 WHEAT May/10 1 467.75
2 WHEAT May/10 2 467.75
3 WHEAT May/10 1 467.75
4 WHEAT May/10 1 467.75
5 COTTON NO.2 May/10 1 78.13
6 COTTON NO.2 May/10 3 78.13
7 COTTON NO.2 May/10 1 78.13
2008 Jul 10
2
false discovery rate !
Dear All,
It is not a typical R question (though I use R for this) but I thought someone will help me. For the list of P values, I have calculated FDR using p.adjust() in R (bioconductor). But my FDR values are same for all the P values. When do we get same FDR values? Does the smallest P values should less than 1/N? (where N is the number of P values)
Thanks in advance.
Kind regards,
Ezhil
2009 Sep 11
3
Working with large matrix
Dear All,
I have large matrix (46000 x 11250). I would like to do the linear regression for each row. I wrote a simple function that has lm() and used apply(mat,1,func). The issue is that it takes ages to load the file and also to finish the lm. I am using LINUX 64 bit with 32G mem. Is there an elegant and fast way of completing this task?
Thanks in advance.
Kind regards,
Ezhil
2007 Apr 27
2
Scatter Plot in R - Help
Dear All,
I am using the following commands to do the scatter
plot of two vectors, say X and Y.
plot(X,Y, col="blue")
abline(a=1,b=1, col="red")
abline(a=-1,b=1, col="green")
I would like to split the scatter plot into 3 part
with 3 different colors: (i) points lies between 2
lines, (ii) points above line 1, and (iii) points
below line 2. I am struggling to do
2006 May 29
2
newbie question: ROW average
Dimitris Rizopoulos wrote:
> look at ?rowMeans; you can also use "apply(mat, 1, mean)" but
> rowMeans() is better.
By my reading of the question, this is not what
Ezhil wants. He said:
``I have a 992 x 74 matrix. I would like to form a new matrix
by averaging each 4 rows from the original one.''
I.e. he wants (I think) the first row of the new matrix
to be the
2005 Oct 26
3
Storing graphics output in PNG format.
Dear All,
How can I store hist() or any plot output graphics in
PNG format? I tried with bitmap() but not getting the
result. Appreciate your help on fixing this.
Thanks in Advance.
Regrads,
Ezhil
2008 Nov 21
2
Extracting diagonal matrix
Dear All,
I have a correlation matrix of size 100 x 100 and would like to extract the diagonal matrix from it. I have used the for loop to store tha correlation values of the diagonal matrix. Is there a 'R way' of doing this?
Thanks in advance.
Kind regards,
Ezhil
2008 Nov 21
2
Calculating correlation for a big matrix
Dear All,
I have a matrix of size 10000 x 50. I would like to calculate all possible pair-wise correlation coefficient (5x10^7 combinations) using cor(). How can I efficiently calcualte and save the result in a matrix?
Thanks in advance.
Kind regards,
Ezhil
2010 Feb 16
2
Error of Stepwise Regression with number of rows in use has changed: remove missing values?
Howdy, R Grues
I have enjoyed R, but I cannot solve one problem easily. Please help my problem.
When I tried the R script, I got the following Error. This error
results from input data file exported through a Excel spreadsheet
software.
Error in step(lm(pop.rate ~ as.numeric(year) + as.factor(policy) +
as.numeric(nation.grant) + ?:
??number of rows in use has changed: remove missing values?