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16 results for “from:David martin”

Median abline how-to ?
David martin · Aug 12, 2010 · r-help

thanks !!! On 12/08/10 17:49, William Dunlap wrote: > segments(x0=ix-w, x1=ix+w, y0=mediansByGroup, col=ix) >

boxplot with diamond shape
David martin · Jan 16, 2012 · r-help

Hi, I haven't found in R a possibility to draw a boxplot with a diamond shape (means and CI). Does anyone know how to plot it ? thanks,

exporting LDA model possible ?
David martin · Mar 22, 2012 · r-help

Hi, is it possible to export the LDA model into a file so that it can be reused in R afterwards ? I have already checked the package "pmml" but does not seem to export LDA models. thanks, david

text overlap in plot
David martin · Jun 24, 2011 · r-help

Hey, Here is a snippet that generated a boxplot and separates points so that they do not overlap. I have a problem to avoir text overlapping. Any help would be helpful. > attach(InsectSprays) boxplot(count ~ spray, data = InsectSprays, outpch = NA...

errorest slow
David martin · Jun 20, 2013 · r-help

Hi , When using errorest on a large dataset (12000 variables) it performs very slow. By looking at the randomforest package it says that for largedatasets the use of the formula is discouraged. So it's better to use the x...

Factors to Columns
David martin · May 20, 2011 · r-help

> str(data) 'data.frame': 250 obs. of 3 variables: $ student: chr "A" "B" "C" "D" ... $ data : num 20.2 20.4 22.5 22.1 23.3 ... $ param : Factor w/ 4 levels "AGE","SCHOOL",..: 1 1 1 1 1 1...

boxplot with diamond shape
David martin · Jan 16, 2012 · r-help

Go to Page 62 Chapter 5 Figure 5.3 Example of Means Diamonds http://www.google.fr/url?sa=t&rct=j&q=boxplot%20diamond%20shape&source=web&cd=14&ved=0CEgQFjADOAo&url=http%3A%2F%2Fwww.jmp.com%2Fsupport...

R and multithread
David martin · Apr 6, 2011 · r-help

Hello, Sorry if this question has been posted before but could't find out exactly an answer to the question.... I'm doing bioinformatics and doing small RNA sequencing that make use of packages such as DESeq and EDGE. For...

randomforest and AUC using 10 fold CV - Plotting results
David martin · Dec 22, 2011 · r-help

Here is a snippet to show what i'm trying to do. library(randomForest) library(ROCR) library(caret) data(iris) iris <- iris[(iris$Species != "setosa"),] fit <- randomForest(factor(Species) ~ ., data=iris, ntree=50) train.predict <- predict(fit,iris,type="prob...

StepAIC and boxplot
David martin · Nov 18, 2011 · r-help

Hello, I have done a stepwise analysis to determine the best model fitting my data. data <- stepAIC( aov (Group)~ . , data=mydata) data > summary(data) Df Sum Sq Mean Sq F value Pr(>F) `a` 1 1.9829 1.98290 11...

Median abline how-to ?
David martin · Aug 12, 2010 · r-help

Hi, I'm newbie with R and don't really know how to add a median line to each of the groups that is not all the plot long. Here is a small working code that i have adapted for...

stepAIC
David martin · Nov 21, 2011 · r-help

Hi, I'm trying to select the best model for a particular problem. So far i have managed to identify a set of variables that woudl explain my model lm1 <- lm(Group ~ . , data=dataf)) > summary(lm1) Df Sum Sq Mean...

epitools question
David martin · May 4, 2012 · r-help

Here is a working snippet. library(epitools) mat <- matrix(c(10,15,60,25,98, 12,10,70,28,14, 9,11,68,10,12 ,8,13,20,11,58) ,ncol=2) colnames(mat) <- c("treatmentA","treatmentB") row.names(mat...

oddsratio epitool and chi-square
David martin · May 4, 2012 · r-help

Here is a working snippet. library(epitools) mat <- matrix(c(10,15,60,25,98, 12,10,70,28,14, 9,11,68,10,12 ,8,13,20,11,58) ,ncol=2) colnames(mat) <- c("treatmentA","treatmentB") row.names(mat...

oddsratio and some basic help on epitools
David martin · May 4, 2012 · r-help

Here is a working snippet. library(epitools) mat <- matrix(c(10,15,60,25,98, 12,10,70,28,14, 9,11,68,10,12 ,8,13,20,11,58) ,ncol=2) colnames(mat) <- c("treatmentA","treatmentB") row.names(mat...

Factors to Columns
David martin · May 20, 2011 · r-help

Works !! thanks On 05/20/2011 12:08 PM, Dennis Murphy wrote: > Hi: > > I'm not sure I have the student part right, but here's one way to get > the structure you're looking for with the reshape2 package...

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