Displaying 20 results from an estimated 4000 matches similar to: "Formula that includes previous row values"
2016 May 25
1
Slow RAID Check/high %iowait during check after updgrade from CentOS 6.5 -> CentOS 7.2
On 2016-05-25 19:13, Kelly Lesperance wrote:
> Hdparm didn?t get far:
>
> [root at r1k1 ~] # hdparm -tT /dev/sda
>
> /dev/sda:
> Timing cached reads: Alarm clock
> [root at r1k1 ~] #
Hi Kelly,
Try running 'iostat -xdmc 1'. Look for a single drive that has
substantially greater await than ~10msec. If all the drives
except one are taking 6-8msec, but one is very
2011 Mar 11
5
How to calculate means for multiple variables in samples with different sizes
Hello R-helpers:
I have data like this:
sample replicate height weight age
A 1.00 12.0 0.64 6.00
A 2.00 12.2 0.38 6.00
A 3.00 12.4 0.49 6.00
B 1.00 12.7 0.65 4.00
B 2.00 12.8 0.78 5.00
C 1.00 11.9 0.45 6.00
C 2.00 11.84 0.44 2.00
C 3.00 11.43 0.32 3.00
C 4.00 10.24 0.84 4.00
D
2010 Aug 30
1
Help With Post-hoc Testing
I am trying to do post-hoc tests associated with a repeated measures
analysis with on factor nested within respondents.
The factor (SOI) has 17 levels. The overall testing is working fine, but I
can''t seem to get the multiple comparisons to work.
The first step is to "stack" the data.
Then I used "lme" to specify and test the overall model.
Finally
2004 Apr 28
3
Possible bug in foreign library import of Stata datasets
Concerning this article, Christopher Zorn, "Generalized Estimating
Equation Models for Correlated Data: A Review with Applications." 2001.
American Journal of Political Science 45(April):470-90.
The author very kindly provides data for replication on his web page:
http://www.emory.edu/POLS/zorn/Data/GEE.zip.
I've been comparing the Professor Zorn's results obtained with
2009 Sep 14
8
10 Node OCFS2 Cluster - Performance
Hi,
I am currently running a 10 Node OCFS2 Cluster (version 1.3.9-0ubuntu1)
on Ubuntu Server 8.04 x86_64.
Linux n1 2.6.24-24-server #1 SMP Tue Jul 7 19:39:36 UTC 2009 x86_64
GNU/Linux
The Cluster is connected to a 1Tera iSCSI Device presented by an IBM
3300 Storage System, running over a 1Gig Network.
Mounted on all nodes: /dev/sdc1 on /cfs1 type ocfs2
2006 Jul 24
3
random section of samples based on group membership
Hi all,
I have a matrix of 474 rows (samples) with 565 columns (variables).
each of the 474 samples belong to one of 120 groups, with the
groupings as a column in the above matrix. For example, the group
column would be:
1
1
1
2
2
2
.
.
.
120
120
I want to randomly select one from each group. Not all the groups
have the same number of samples, some have 4, some 3 etc. Is there a
function to
2016 Apr 19
2
Creating two new variables conditional on retaining values from previous rows
Hello,
Iam looking for an R solution that can efficiently produce the output shown below. I can produce this easily in SAS with retain statement and a few lines of if-then-else logic, etc.. but I am not find anything similar on the Rforum archives. Below is the logic I am trying to apply to produce the output table below. Thanks in any help!
if the ID is the first ID encountered then group=1 and
2009 Mar 07
1
Week value function
Hi R users,
I am looking for a date function that will give the following:
- The number-of-week value is in the range 01-53
- Weeks begin on a Monday and week 1 of the year is the week that
includes both January 4th and the first Thursday of the year.
If the first Monday of January is the 2nd, 3rd, or 4th, the
preceding days are part
of the last week of the preceding
2006 Oct 02
5
Barplot
Hello,
I have used the following data to draw my barplot:
BL LR Q
36.35 1.00 1.92
36.91 4.00 0.00
25.70 6.00 0.00
34.38 3.00 1.92
05.32 0.50 0.00
BL<-c(36.35, 36.91, 25.70, 34.38, 05.32)
LR<-c(1.00, 4.00, 6.00, 3.00, 0.50)
Q<-<(1.92, 0.00, 0.00, 1.92, 0.00)
barplot(dt$LR, main='LR Value', col='orange', border='black',
2017 Jun 29
3
Help : glm p-values for a factor predictor
Hello,
i am a newby on R and i am trying to make a backward selection on a
binomial-logit glm on a large dataset (69000 lines for 145 predictors).
After 3 days working, the stepAIC function did not terminate. I do not
know if that is normal but i would like to try computing a "homemade"
backward with a repeated glm ; at each step, the predictor with the max
pvalue would be
2009 Feb 14
6
Outlier Detection for timeseries
Hello R users,
Can someone tell if there is a package in R that can do outlier detection
that give outputs simiilar to what I got from SAS below.
Many thanks in advance for any help!
Outlier Details
Approx
Chi-
2011 Jul 12
7
FW: lasso regression
Hi,
I am trying to do a lasso regression using the lars package with the following data (see attached):
FastestTime
WinPercentage
PlacePercentage
ShowPercentage
BreakAverage
FinishAverage
Time7Average
Time3Average
Finish
116.90
0.14
0.14
0.29
4.43
3.29
117.56
117.77
5.00
116.23
0.29
0.43
0.14
6.14
2.14
116.84
116.80
2.00
116.41
0.00
0.14
0.29
5.71
3.71
117.24
2005 Jan 06
1
nls - convergence problem
Dear list,
I do have a problem with nls. I use the following data:
>test
time conc dose
0.50 5.40 1
0.75 11.10 1
1.00 8.40 1
1.25 13.80 1
1.50 15.50 1
1.75 18.00 1
2.00 17.00 1
2.50 13.90 1
3.00 11.20 1
3.50 9.90 1
4.00 4.70 1
5.00 5.00 1
6.00 1.90 1
7.00 1.90 1
9.00 1.10 1
12.00 0.95 1
14.00
2017 Jun 29
0
Help : glm p-values for a factor predictor
It might help if you provided the code you used. It's possible that
you didn't use direction="backward" in stepAIC(). Or if you did, it
was still running, so whatever else you try will still be slow. The
statement "R provides only the pvalues for each level" is wrong: look
at the anova() function.
Bob
On 29 June 2017 at 11:13, Beno?t PELE <benoit.pele at
2009 Jun 16
4
confusion on levels() function, and how to assign a wanted order to factor levels, intentionally?
Dear R-helpers,
I want to make a series of boxplots on several numeric univariates with two
group variables (species and population, population nested in species, and
with population as the X-axis). In order to get a proper order of the
individual populations in X-axis, I need to assign a wanted order to the
factor (population). I used the levels() function to do this assignment, but
it seemed
2002 Nov 27
2
Error message: missing value where logical needed
Dear all,
I often import data sets from other programs that contain user defined
missing values. As an example consider a variable MXPLOCO with a user
defined missing value of as -9.
> summary(MXPLOCO)
Min. 1st Qu. Median Mean 3rd Qu. Max. NA's
-9.000 4.750 5.000 5.349 6.000 8.500 2.000
The following command successfully converts the value -9 to NA. However,
2008 Oct 07
1
FW: Reading Data
Rahul Agarwal
Analyst
Equities Quantitative Research
UBS_ISC, Hyderabad
On Net: 19 533 6363
hi let me explain you the problem
we have a database which is in this format
Stocks 30-Jan-08 28-Feb-08 31-Mar-08 30-Apr-08
a 1.00 3.00 7.00 3.00
b 2.00 4.00 4.00 7.00
c 3.00 8.00 655.00 3.00
d 4.00 23.00 4.00 5.00
e 5.00 78.00 6.00 5.00
and we have a query
2007 Sep 14
2
quantiles and dataframe
Hi
I have a dataframe, RQ, like this:
A B1 B2 B3
1 NA 112 12
2 NA 123 123
3 NA 324 13
4 3 21 535
5 4 12 33
6 7 1 335
7 4 NA 3535
8 4 NA NA
9 NA NA NA
10 5 NA NA
12 4 NA NA
15 2 NA NA
17 3 NA 1
63 1 NA 1
75 NA NA NA
100 NA NA NA
123 NA NA
2009 Oct 20
0
[LLVMdev] 2.6 pre-release2 ready for testing
Hi Tanya,
> 1) Compile llvm from source and untar the llvm-test in the projects
> directory (name it llvm-test or test-suite). Choose to use a
> pre-compiled llvm-gcc or re-compile it yourself.
I compiled llvm and llvm-gcc with separate objects directories.
Platform is x86_64-linux-gnu.
> 2) Run make check, report any failures (FAIL or unexpected pass). Note
> that you need to
2006 Aug 11
1
x tick labels - sparse?
Hi,
I'm stuck on creating a plot with x tick labels for every Nth tick
mark - how is that done? I don't see a simple solution to this in
help(plot) or help(par) and what I've tried is not working, eg, the
following does not work, although it seems intuitive to me that it
should work:
x <- seq(-100,1000,25)
y <- x * x
% find all the x values that are multiples of 100
tmp <-