Displaying 18 results from an estimated 18 matches for "harwood262".
2012 Jan 09
1
glmmPQL and predict
Is the labeling/naming of levels in the documentation for the
predict.glmmPQL function "backwards"? The documentation states "Level
values increase from outermost to innermost grouping, with level zero
corresponding to the population predictions". Taking the sample in
the documentation:
fit <- glmmPQL(y ~ trt + I(week > 2), random = ~1 | ID,
family =
2011 May 02
3
ID parameter in model
Hello,
I am apparently confused about the use of an id parameter for an event
history/survival model, and why the EHA documentation for aftreg does
not specify one. All assistance and insights are appreciated.
Attempting to specifiy an id variable with the documentation example
generates an "overlapping intervals" error, so I sorted the original
mort dataframe and set subsequent entry
2011 Dec 13
1
tcplot documentation in evd package
Hello, and please advise regarding any errors/omissions on my part.
However, the documentation for R's tcplot function in the evd package
appears to contain an error. I am using evd version 2.2-4 in R 2.14.0
with Windows XP.
> data(portpirie)
> mrlplot(portpirie) ## No Error
> tlim <- c(3.6, 4.2)
> tcplot(portpirie, tlim) ## Line from documentation
Error in fpot(data, u[1],
2010 Jan 20
1
Line Plot with Dates on X-axis
I am trying to generate a line graph with quarterly time buckets (with
nice labels) on the x-axis. The first block of code below will
generate the graph with nicely formatted x-axis labels, but the
"type=" and "col=" options are not recognized when factors are used
for the x-axis.
The second block, where the quarter values are mapped into dates, will
plot the line nicely but
2011 May 08
1
Syntax for iter.max in rms
Hello,
I would like to increase the number of iterations for running a
Buckley-James regression model in the rms package, but something is
apparently syntactically wrong. The following code initially is
exactly as it appears in the help page (which runs successfully), then
a "failure to converge" message (resulting from specifying an
'identity' link argument, the error message
2011 May 21
1
predict 'expected' with eha package
I am unsure what is being returned, and what is supposed to be
returned, when using 'predict' with "type='expected'" for an aftreg
survival model. The code below first generates a weibull model, then
uses predict to create a vector of the linear predictors, then
attempts to create the 'expected' vector, which is empty. The final
two steps in the code generate a
2012 Jan 06
2
Dropping columns from data frame
How does R do it, and should I ever be worried? I always remove
columns by index, and it works exactly as I would naively expect - but
HOW? The second illustration, which deletes non contiguous columns,
represents what I do all the time and have some trepidation about
because I don't know the mechanics (e.g. why doesn't the column
formerly-known-as-4 become 3 after column 1 is dropped:
2011 Jan 06
0
Set axis limits in mixtools plot
Hello,
Can the x and y axis limits be specified in a density plot with the
mixtools package for a finite mixture model? Uncommenting the xlim2/
ylim2 lines in the plot command below generates 'not a graphical
parameter' warnings (and does not change the axis settings), and
uncommenting the xlim/ylim lines generates a 'formal argument "ylim"
matched by multiple actual
2010 Feb 12
1
Assign Name of Data Frame
Hello R Experts,
How can I assign the name of a data frame with the argument of a
function? Specifically I am using RODBC to build local dataframes
from SAS datasets on a
remote server. I would like the local dataframe have the same name as
the source SAS dataset, and the function below is what I am
developing. However, the "substitute(table)" on the left side of the
assignment
2010 Nov 10
0
biglm and epicalc ROC curves
Hello list,
I am trying to avoid "Rifying" some of my SAS code to generate ROC
plots, and the logistic.display() and lroc() functions in the epicalc
package do what I want. However, I must generate my logistic model
with bigglm because I have 1) limited hardware, 2) ~2.5 million rows,
and 4 categorical and 2 continuous independent variables. When I
attempt to invoke epicalc's
2010 Dec 23
1
Reconcile Random Samples
Is there a way to generate identical random samples using R's runif
function and SAS's ranuni function? I have assigned the same seed
values in both software packages, but the following results show
different results. Thanks!
R
===
> set.seed(6)
> random <- runif(10)
> random
[1] 0.6062683 0.9376420 0.2643521 0.3800939 0.8074834 0.9780757
0.9579337
[8] 0.7627319 0.5096485
2011 Sep 28
1
survexp with large dataframes
Hello, and thank you in advance.
I would like to capture the expected survival from a coxph model for
subjects in an observational study with recurrent events, but the
survexp statement is failing due to memory. I am using R version
2.13.1 (2011-07-08) on Windows XP.
My objective is to plot the fitted survival with the Kaplan-Meier
plot. Below is the code with output and [unfortunately]
2008 Apr 07
2
basehaz and newdata
I am unable to get the basehaz function to apply a proportional
hazards model to a new data frame. I replicated my specific situation
with the example for coxph in the help, where I changed the x value of
the first record from 0 to 1. Is there something incorrect in the
syntax that I am using? Thanks in advance!
test1 <- list(time= c(4, 3,1,1,2,2,3),
status=c(1,NA,1,0,1,1,0),
2011 Jan 07
0
Error in x %*% coef(object) : non-conformable arguments
Hello, and thanks in advance!
What does the error message "Error in x %*% coef(object) : non-
conformable arguments" when indicate when predicting values for
newdata with a model from bigglm (in package biglm), and how can I
debug it? I am attempting to do Monte Carlo simulations, which may
explain the somewhat interesting loop which follows. After the code I
have included the output,
2009 Nov 06
1
Survival Plot in R 2.10.0
I would like to produce a complimentary log-log survival plot with
only the points appearing on the graph. I am using the code below,
taken from the plot.survfit page of help for the the survival package
(version 2.35-7).
I am running in R 2.10.0 on Windows XP, and the list of packages
following
the error is loaded. Is there some specific 'type= ' syntax, or an
additional parameter
that
2012 May 25
1
Multiple rms summary plots in a single device
I would like to incorporate multiple summary plots from the rms
package into a single device and to control the titles, and also to
open a new device when I reach a specified number of plots. Currently
I am only getting a single "plot(summary(" graph in the upper left-
hand corner of each successive device. However, in the rms
documention I see instances of a loop being used with
2011 Apr 20
2
survexp with weights
Hello,
I probably have a syntax error in trying to generate an expected
survival curve from a weighted cox model, but I can't see it. I used
the help sample code to generate a weighted model, with the addition
of a "weights=albumin" argument (I only chose albumin because it had
no missing values, not because of any real relevance). Below are my
code with the resulting error
2011 Jan 10
1
debug biglm response error on bigglm model
G'morning
What does the error message "Error in x %*% coef(object) : non-
conformable arguments" indicate when calculating the response values
for
newdata with a model from bigglm (in package biglm), and how can I
debug it? I am attempting to do Monte Carlo simulations, which may
explain the loop in the code that follows. After the code I
have included the output, which shows that