Displaying 20 results from an estimated 800 matches similar to: "Glitch when creating online help"
2005 Nov 28
3
Looking for constrained optimisation code
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Hi,
I was just wondering if there was any available R code that could handle
general constrained optimisation problems. At the moment I'm using
nlminb and optim, both of which allow box constraints on the parameters,
but ideally I'd like to be able to specify more general constraints on
the solution
2005 Nov 16
1
Unexpected result of names<-
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Note: This e-mail is subject to the disclaimer contained at the bottom of this message.
_______________________________________________________________________________________
Hi,
I came across some rather unexpected behaviour the other day with
assigning names and lists. Here's an example.
> z
2006 Dec 11
3
Problem with sas.get function in Hmisc
Thomas,
As F Harrel in a preceding message told me that you are the maintainer
of Hmisc package,
I write directly to you, with copy to the Rhelp list in case someone
encountered the same problem and find some benefit in the response.
I used quite often the function sas.get in Hmisc library which I is
very, very useful.
But, as trying to reuse it today it seems not to function anymore.
I tried
2005 Nov 28
3
glm: quasi models with logit link function and binary data
# Hello R Users,
#
# I would like to fit a glm model with quasi family and
# logistical link function, but this does not seam to work
# with binary data.
#
# Please don't suggest to use the quasibinomial family. This
# works out, but when applied to the true data, the
# variance function does not seams to be
# appropriate.
#
# I couldn't see in the
# theory why this does not work.
# Is
2007 Jul 04
2
for loop doesn't stop with upper loop value
Hi list,
could anyone please educate me on the following:
lst<-seq(47, 239, by=12)
for(n in lst)
{
lower=n; upper=lower+10
for(i in lower+2 : upper)
{
print(paste(n, " i: ", i, " lower: ",lower, " upper :", upper))
}
}
does not stop when i = upper
A while loop fixes this but, I still don't understand why the for loop
doesn't stop
2006 Oct 30
3
plot history
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Hi,
When I create multiple graphs subsequent graphs overwrite previous
graphs. How do I keep all my graphs in the current workspace (but not
all on the same page) so I can scroll through them?
thanks,
Rohini
Rohini Mulford
Senior Research Analyst
Technical Research
Research &
2013 Mar 01
2
issue creating a subset
I'm performing item response theory with eRm packages
I am excluding the persons that doesn't fit in the infit/outfit persons.
for that I created a condition. then I have to create a new subset or
matrix but with the condition.
So:
ORIGINAL
matrix<-cbind(item1, item2, item3, item4)
IF I PERFORM A head(matrix)
item1 item2 item3 item4
3 2 3 1
3 1
2013 Mar 21
1
Error Message During ANOVA
I am teaching myself R for use in Psych research. I don't understand the error message I am getting or how to fix it. Any suggestions will be greatly appreciated
df1=read.table("fastfood.txt", header=TRUE); df1
>
> c(t(as.matrix(df1)))
>
> r = c(t(as.matrix(df1))) # response data
>
> r
>
f=c("item1","item2", "item3")
> k=3
>
2008 Jan 10
1
data.frame manipulation: Unbinding strings in a row
Hi all,
I have a data.frame I received with data that look like this (comma
separated strings in last row):
ID Shop Items
ID1 A1 item1, item2, item3
ID2 A2 item4, item5
ID3 A1 item1, item3, item4
But I would like to unbind the strings in col(2) items so that it will look
like this:
ID Shop Items
ID1 A1 item1
ID1 A1 item2
ID1 A1 item3
ID2 A2 item4
ID2 A2 item5
ID3 A1 item1
ID3 A1 item3
ID3 A1
2006 Jun 14
3
A question about stepwise procedures: step function
Dear all,
I tried to use "step" function to do model selection, but I got an error massage. What I don't understand is that data as data.frame worked well for my other programs, how come I cannot make it run this time. Could you please tell me how I can fix it?
***************************************************************************************************
2008 May 02
2
Transform values from one column into column names of new dataframe
Hi, I have a question about reformatting data. It looks like it should
be simple, but I've been working at it for awhile now and it's about
time I ask for help.
My data look like this:
ITEM VALUE STEP
item1 A first
item2 C first
item2 D second
item1 A second
item3 A first
item3 B second
item3 A third
I just want to transform
2005 Nov 23
2
negative binomial overdispersion question
Hello,
I'm a grad student in the Intelligent Transportation Systems lab at Portland
State Univ. in Portland, OR, USA. I'm trying to learn the basics of R to run a
negative binomial in the near future, and so I ran a test regression on roadway
crash data obtained from "Statistical and Econometric Methods for
Transportation Data Analysis" by Washington et al (p. 250). I ran the
2005 Nov 22
4
the matrix of rows with specific row sums
I am just starting with R and have the following problem: given a matrix
of ones and zeroes, say
mdim=4
m<-matrix(round(runif(mdim^mdim)),mdim,mdim)
how to construct the matrix of those rows of m, whose elements sum to 2.
Contrary to the random matrix above, the actual matrix always has at
least one such row.
Serguei Kaniovski
2011 Aug 21
1
rank analysis - reinventing the wheel?
Hello,
I have two data frames. One is my dependent variable and the other is my
independent variable. For each row I'd like to split the independent
variable into fractiles (25 or more) and calculate the average value of the
dependent variable. Then I would like to plot the average of the averages
for each row for each fractile. If possible, I'd like to have the option to
1) define the
2005 Nov 29
1
rlogis() in simulation
Dear List:
We are generating data such that students are clustered in schools for
some item response data for a simulation study. One component of our
simulation is to generate measurement error from a logistic distribution
with a mean of 0 and standard deviation of 1.7 to match the logistic
curve of the Rasch model.
We are generating an error term for each of the 40 hypothetical test
items a
2013 Feb 26
2
Converting code to R Question
I'm learning R and am converting some code from SPSS into R. My background
is in SAS/SPSS so the vectorization is new to me and I'm trying to learn
how to NOT use loops...or use them sparingly. I'm wondering what the
most efficient to tackle a problem I'm working on is. Below is an example
piece of code. Essentially what it does is set a variable to zero, loop
through item
2007 Mar 07
5
hwo can i get a vector that...
dear all,
how can i get a vector that shows the number of the column of matrix
that contains the maximum of the row ??
can?t believe in need a loop for this...
i have a 100 x 3 matrix and want to get a 100 x 1 vector with values
1,2,3 .
there must be a simple solution. i just cannot find it. i think am
searching on the wrong end.
thx for help in advance.
m.
2012 Sep 03
1
R suitability for development project
Hello All,
Eric Langley here with my first post to this list. I am looking to
determine if R is suitable for a development project I am working on
and if so possibly finding someone proficient in R that would be
interested in doing the coding.
I would like to preface my inquiry that while I am not a programmer I
can communicate in a dialog my objectives.
An array of rank ordered data looks like
2013 Apr 16
1
Path Diagram
Hi All,
Apologies if this has been answered somewhere else, but I have been
searching for an answer all day and not been able to find one.
I am trying to plot a path diagram for a CFA I have run, I have installed
Rgraphviz and run the following:
pathDiagram(cfa, min.rank='item1, item2, item3, item4, item5, item6,
item7, item8, item9, item10, item11, item12', max.rank='SMP,
2006 Sep 28
3
ruby alternative to php's implode and expload functions
is there a method similar to php''s expload function in ruby. i have a
database field that contains an array of items, when i output this field
i notice the items are seperated by ''-'' e.g item1-item2-item3.
how would i go about putting them back into an array in ruby. for
example in PHP i would just do this:
$field; // = item1-item2-item3
$field_as_array =