Displaying 20 results from an estimated 200 matches similar to: "simple questions"
2007 May 15
3
aov problem
I am using R to make two-way ANOVA on a number of variables using
g <- aov(var ~ fact1*fact2)
where var is a matrix containing the variables.
However the outcome seem to be dependent on the order of fact1 and fact2
(i.e. fact2*fact1) gives a slightly (factor of 1.5) different result.
Any ideas why this is?
Thanks for any help
Anders
2009 Jan 23
3
Table Modification
I am trying to construct a two-way table where, instead of printing the
two-way frequencies in the table, I would like to print the values of a
third variable that correspond to the frequencies.
For example, the following is easily constructed in R
> fact1 <- factor(sample(LETTERS[1:3],10,replace=TRUE))
> fact2 <- factor(sample(LETTERS[25:26],10,replace=TRUE))
> fact3
2009 Nov 12
1
Rearranging long tables, Sweave, xtable, LaTeX
Dear R-users,
consider the two following outputs, ## 1 and ## 2
\begin{Scode}{Setup, echo = FALSE, print = FALSE, eval = TRUE}
with(expand.grid(Fact1 = 1:3, Fact2 = 1:40), table(Fact1,
Fact2)) ## 1
xtable(with(expand.grid(Fact1 = 1:3, Fact2 = 1:40), table(Fact1,
Fact2))) ## 2
\end{Scode}
The first line
with(expand.grid(Fact1 = 1:3, Fact2 = 1:40), table(Fact1, Fact2))
2004 Aug 10
4
Enduring LME confusion… or Psychologists and Mixed-Effects
Dear ExpeRts,
Suppose I have a typical psychological experiment that is a
within-subjects design with multiple crossed variables and a continuous
response variable. Subjects are considered a random effect. So I could model
> aov1 <- aov(resp~fact1*fact2+Error(subj/(fact1*fact2))
However, this only holds for orthogonal designs with equal numbers of
observation and no missing values.
2004 Aug 11
1
Fwd: Enduring LME confusion… or Psychologists and Mixed-Effects
In my undertstanding of the problem, the model
lme1 <- lme(resp~fact1*fact2, random=~1|subj)
should be ok, providing that variances are homogenous both between &
within subjects. The function will sort out which factors &
interactions are to be compared within subjects, & which between
subjects. The problem with df's arises (for lme() in nlme, but not in
lme4), when
2002 Jan 22
1
lme and mixed effects
Dear r-help,
With lme, is there a way to specify multiple fixed factors under one level of grouping?
For example, for a single fixed factor, I use the following:
fm1.lme <- lme(fixed=resp ~ fact1, random=~1|subj/fact1, data=mydata)
I would like to have multiple factors under subj, like the following
for a two-way design, but I get an error:
fm2.lme <- lme(fixed=resp ~ fact1*fact2,
2004 May 28
1
dotchart questions
I am trying to put 3 dotcharts side-by-side with minimal space between
each. Each chart is for a different variable, but the vertical axes are
the same.
I want to have vertical axis labels on the lefthand chart but no
vertical axis labels on the other two. Plus, I would like very little
space between charts 1 & 2 and between charts 2 & 3.
I have one approach but am not too happy with
2005 Apr 28
2
Reconstruction of a "valid" expression within a function
Hello all,
I have some trouble in reconstructing a valid expression within a
function,
here is my question.
I am building a function :
SUB<-function(DF,subset=TRUE) {
#where DF is a data frame, with Var1, Var2, Fact1, Fact2, Fact3
#and subset would be an expression, eg. Fact3 == 1
#in a first time I want to build a subset from DF
#I managed to, with an expression like eg. DF$Fact3,
# but I
2008 Feb 20
3
reshaping data frame
Dear all,
I'm having a few problems trying to reshape a data frame. I tried with
reshape{stats} and melt{reshape} but I was missing something. Any help is
very welcome. Please find details below:
#################################
# data in its original shape:
indiv <- rep(c("A","B"),c(10,10))
level.1 <- rpois(20, lambda=3)
covar.1 <- rlnorm(20, 3, 1)
level.2
2005 Dec 01
8
Impaired boxplot functionality - mean instead of median
Hello to all users and wizards.
I am regulary using 'boxplot' function or its analogue - 'bwplot' from
the 'lattice' library. But they are, as far as I understand, totally
flawed in functionality: they miss ability to select what they would
draw 'in the middle' - median, mean. What the box means - standard
error, 90% or something else. What the whiskers mean -
2004 Aug 12
0
Re: R-help Digest, Vol 18, Issue 12
The message for aov1 was "Estimated effects <may> be unbalanced". The
effects are not unbalanced. The design is 'orthogonal'.
The problem is that there are not enough degrees of freedom to estimate
all those error terms. If you change the model to:
aov1 <-
aov(RT~fact1*fact2*fact3+Error(sub/(fact1+fact2+fact3)),data=myData)
or to
aov2 <-
2008 Aug 07
2
lattice: add vertical lines in xyplot
Hi list,
This is a very basic question about lattice: I wish to add some
vertical lines in each panel of a xyplot as demonstrated in this
example:
> library(lattice)
>
> xx <- seq(1, 10, length=100)
> x <- rep(xx, 4)
> y <- c(cos(xx), sin(xx), xx, xx^2/10)
> fact <- factor(rep(c("cos", "sin", "id", "square"), each=100))
2008 Oct 07
2
panel.groups: use group.number to define colors
Dear list,
I've been trying this for a few hours and I just don't understand how
lattice works with groups and subscripts.
Consider the following example,
> xx <- seq(1, 10, length=100)
> x <- rep(xx, 4)
> y <- c(cos(xx), sin(xx), xx, xx^2/10)
> fact <- factor(rep(c("cos", "sin", "id", "square"), each=100))
> fact2
2007 Oct 27
1
Selectively swapping labels between factors
Dear R-helpers,
I'm trying to selectively swap labels between two factors, depending
on an indicator variable i.
Can you point me to a solution, and perhaps how I could have found it?
labels(fact1) is a character vector of r row numbers
levels(fact1) is a character vector of the n < r unique levels
How do I then get the character vector of length r of the levels of
fact1?
Once I have
2008 Jul 03
1
ggplot2 legend for vertical lines
Dear all,
The following example code produces a graph with ggplot2, to which I
add several vertical lines of arbitrary colors. I am not satisfied
with the legend: it automatically adds some vertical lines which I'd
rather not see (they confuse the reader rather than add information
in this case).
> library(ggplot2)
> dfr <- data.frame(values = sin(1:50/10),
> fact =
2010 Nov 09
1
agrep pmatch recursive???
Hello R Helpers,
Business - 64 bit windows 7, R 2.11.1
I am trying to match the character contents of one list, called 'exclude', to those of a second list, called 'dataset'
dataset is a list of file names with folder locations, and looks like this when called:
> dataset
[1] "A/10-10-29a-13.cdf" "A/10-10-29a-14.cdf" "A/10-10-29a-15.cdf"
2006 Sep 20
1
problem coercing truncated character vector to levels
Dear R wizes,
I have a data.frame of species abundances with column names consisting
of 4 letter codes then an underscore and a number like this:
abco_1, abco_2, abco_3, psm_1, psme_2, psme_3, etc.
I would like to get an identifier for all the abco, and psme and other
species etc.
I used
spec.fact<-substring(names(spec.count),1,4)
To make a vector of the first 4 letters of
2005 Apr 26
0
Construction of a "mean" contengency table
Hi List,
Say I have a data.frame "DF" with 6 columns, 3 factors and 3 variables,
with different number of repetitions for each combination of factors.
I would like to build, for two given factors, a matrix per variable,
containing in each cell the mean or sd for a given couple of factors.
I have managed to get to the result I wanted step by step, but I would
like to have it in a
2003 Jan 27
1
survival bug? (PR#2499)
--Apple-Mail-27-953181986
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
charset=US-ASCII;
format=flowed
a possible bug with survival analysis - either in R or in SPSS...
find more details in bug.doc, and the data in bug.txt
best
Pius Korner
--Apple-Mail-27-953181986
Content-Disposition: attachment
Content-Type: multipart/appledouble;
boundary=Apple-Mail-28-953181987
2012 Dec 12
4
Matrix multiplication
Hi,
I have a transition matrix T for which I want to find the steady state matrix for. This could be approximated by taking T^n , for large n.
T= [ 0.8797 0.0382 0.0527 0.0008
0.0212 0.8002 0.0041 0.0143
0.0981 0.0273 0.8802 0.0527
0.0010 0.1343 0.0630 0.9322]
According to a text book I have T^200 should have reached the steady state L
L