Displaying 20 results from an estimated 20000 matches similar to: "plot() > point names ?"
2009 Jul 09
9
Population pyramids
Hi, I hope somebody can help me with this issue: I am doing population pyramids using the barplot command, so in the left side I have male age structure and in the right side the female age structure. To plot the male age structure I put the data in negative numbers. Now, I want to change the sign in the bar plot in such way that I have no-sign numbers, both in left and right side of the graph. I
2009 Jul 24
4
CI wiskers
I have a matrix containing means and CIs (lower and upper in two columns, so
three columns for every data point) for several points. I have to build a
graph of these means accompained by the CIs (as wiskers). No problems with
making the graph of means, but I don't know how to introduce CIs.
Can anybody advise?
--
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2008 Feb 27
4
Error in cor.default(x1, x2) : missing observations in cov/cor
Hello,
I'm trying to do cor(x1,x2) and I get the following error:
Error in cor.default(x1, x2) : missing observations in cov/cor
A few things:
1. I've used cor() many times and have never encountered this error.
2. length(x1) = length(x2)
3. is.numeric(x1) = is.numeric(x2) = TRUE
4. which(is.na(x1)) = which(is.na(x2)) = integer(0) {the same goes for
is.nan()}
5. I also try
2009 Sep 20
3
statistics
The myoglobin sequence, with reference number NM_005368 in Gen bank, has the
following
frequencies of DNA nucleotides:
A C G T
237 278 309 242
Do these data provide sufficient evidence, at the 1% level of significance,
that the DNA nucleotides
have an unequal distribution, that is the DNA nucleotides are not evenly
utilised?
Clearly state your hypothesis, test statistic and conclusion.
2009 Nov 11
3
how to use # in a rd doc in url address
I am writing a rd doc, and need to use "#" in a url adress. This would make:
\url{http://www.xxxx.org/myfolder/#myanchor}
Of course, I suppose this will not work because # is a special character
starting a comment line in the rd dialect. I did not found a similar
example in "Writing R exentions". I am not sure bout using \dQuote{a
quotation}), and use \sQuote and \dQuote
2009 Oct 28
5
re gression with multiple dependent variables?
i have a series of regressions i need to run where everything is the same
except for the dependent variable, e.g.:
lm(y1 ~ x1+x2+x3+x4+x5, data=data)
lm(y2 ~ x1+x2+x3+x4+x5, data=data)
lm(y3 ~ x1+x2+x3+x4+x5, data=data)
is it possible to run all these regs with a single command? given that the
bulk of the work for linear regressions is inverting a matrix that depends
only on the independent
2008 Mar 31
2
Finding a mean value of a variable holding a dummy variable fixed
I have time-series data on approval ratings of British Prime Ministers. The
prime ministers dating from MacMillan onward till today are coded as dummy
variables and the approval ratings are entered for each month. I want to
know the mean value of the approval rating of each Prime Minister in the
dataset and the approval rating during his/her first month and last month as
PM. What R code should
2009 Sep 08
3
Omnibus test for main effects in the face ofaninteraction containing the main effects.
Daniel,
When Group is entered as a factor, and the factor has two levels, the
ANOVA table gives a p value for each level of the factor. What I am
looking for is the omnibus p value for the factor, i.e. the test that
the factor (with all its levels) improves the prediction of the outcome.
You are correct that normally one could rely on the fact that the model
2008 Jul 09
1
plot gam "main effect functions" in one graph
Dear R users,
I have a question about the plot with the package gam.
I need to plot different main effect functions, related to different
gam models, in the same graphics (i.e. the same covariate about
different models).
I used the plot.gam e preplot.gam documentations. Using preplot.gam I
can plot the single function but I'm not able to put all the functions
together.
Does anybody can help
2009 Jul 14
5
plotting confidence intervals
Hi R People:
If I have a fitted values from a model, how do I plot the
(1-alpha)100% confidence intervals along with the fitted values,
please?
Also, if the intervals are "shaded" gray, that would be nice too, please?
I check confint, but that doesn't seem to do what I want.
Thanks in advance,
Sincerely,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and
2009 Aug 05
4
for loop
I am trying to get the function "Models" to work each time there is an
instance of k. This code will stop after the first model is complete. I need
it to come back and pass the next value of c into the "Initial.State"
function. any ideas?
col<-c(23:28)
#Setup
for(k in col){
Initial.State(Response=zample[,c(k,29)],
Explanatory=zample[,variable_columns],
2008 Nov 24
3
count the cumulative for each subject
I have a data set like the following:
subject visit x1
1 1 0.5
1 2 1.2
1 3 0.7
2 1 0.4
2 2 0.6
2 3 1.0
.....
where x1 is the interval between the two visits. Now I want to calculate the
cumulative intervals since the beinging, for example
subject visit x1 cum
1 1 0.5 0.5
1 2 1.2 0.5+1.2
1 3 0.7 0.5+1.2+0.7
2 1 0.4 0.4
2 2 0.6 0.4+0.6
2 3 1.0 0.4+0.6+1.0
.....
is there an easy to generate the
2008 Feb 26
3
OLS standard errors
Hi,
the standard errors of the coefficients in two regressions that I computed
by hand and using lm() differ by about 1%. Can somebody help me to identify
the source of this difference? The coefficient estimates are the same, but
the standard errors differ.
####Simulate data
happiness=0
income=0
gender=(rep(c(0,1,1,0),25))
for(i in 1:100){
happiness[i]=1000+i+rnorm(1,0,40)
2010 Apr 08
2
Problem using elements in a vector
Hi
So my particular problem is this:
I have a row vector of length 5200 elements - specifically created by
x<-rbinom(5200,1,0.5)
y<-matrix(x,nrow=1,ncol=5200)
y
now, each element is either a 0 or a 1 - e.g. it could be
(0,1,1,1,1,0,0,0,1,1,1) e.t.c.
when the element is a 1, i need to multiply a number (say 1000) by 1.005,
and if it is 1 again, multiply it _again_ by 1.005.
so for
2007 Dec 31
3
Survival analysis with no events in one treatment group
I'm trying to fit a Cox proportional hazards model to some hospital
admission data. About 25% of the patients have had at least one
admission, and of these, 40% have had two admissions within the 12
month period of the study. Each patients has had one of 4
treatments, and one of the treatment groups has had no admissions for
the period. I used:
2008 Dec 11
1
Extract rows from data frame based on row names from another data frame
Hi all,
Is there a function to extract row names from a data frame based on
row names from another data frame? I can write a loop function to do
this, but this may be inefficient in terms of processing.
thanks for any information,
Wade
2009 Sep 08
2
Fitting a linear model with a break point
Hello,
I would like to test some data to see whether it has the shape of a step
function (i.e. y1 up until x_th and then y2 where x_th is the
threshold). The threshold x_th is unknown and the x values can only
take discrete values (0,1,2,3,4).
An example would be:
data<- data.frame(x=1:20,y=c(rnorm(10),rnorm(10,10)))
I was thinking along the lines of fitting some sort of piiecewise linear
2008 Aug 07
4
Obtaining the first /or last record of a subject in a longitudinal study
Dear R users,
I was wondering if anyone knows how to obtain(subset) the first and/or the
last record of a subject in a longitudinal setup.
Normally in SAS one uses first.variable1 and last.variable1. So my question
is that is there an R way of doing this.
Regards,
--
Luwis Diya, Phd student (Biostatistics),
Biostatistical Center,
School Of Public Health,
Catholic University of Leuven,
U.Z. St
2008 Jun 17
4
PCA analysis
Hi,
I have a problem with making PCA plots that are readable.
I would like to set different sympols instead of the numbers of my samples or their names, that I get plotted (xlabs).
How is this possible? With points, i donĀ“t seem to get the right data plotted onto the PCA plot, as I do not quite understand from where it is taken. I dont know how to
plot the correct columns of the prcomp
2008 Jul 08
8
Sum(Random Numbers)=100
Hi R,
I need to generate 50 random numbers (preferably poisson), such that
their sum is equal to 100. How do I do this?
Thank you,
Shubha
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