The relationship between two variables can be visually represented using a scatter plot and will provide some insight into the correlation between the variables and possible models to describe the relationship. There are different ways to produce scatter plots in R making use of either the base graphics system, the lattice graphics library, ggplot2 or
I am not a fan of MS Windows software. However, the reality is that majority of people use it and it is often easier for me to live with this than to convert the sorounding souls. Additionally I am find ing out lately that majority of my favourite open...
I am not a fan of MS Windows software. However, the reality is that majority of people use it and it is often easier for me to live with this than to convert the sorounding souls. Additionally I am find ing out lately that majority of my favourite open...
The plot of Amazon sales rank over time generated in example 7.14 leaves questions. From a software perspective, we'd like to make the plot prettier, while we can embellish the plot to inform our interpretation about how the rank is calculated.For the latter purpose, we'll create an indicator of whether the rank was recorded in nighttime (eastern US...
If you use Emacs and ESS to run R, then here’s a nice tweak I found on the Emacs Wiki. The following bit of elisp goes in your .emacs file (or equivalent). Starting with an R file in the buffer, hitting shift-enter vertically splits the window and starts R in the right-side buffer. If R
Christian: of course you will be running the Chicago 2010 marathon as your next fall marathon. Not only are Paris and Chicago jumelée (i.e. sister cities), but the Dollar is so conveniently falling vis-à-vis the Euro that you'd get all this done for about a Euro and a half by the time the race happens. Moreover, 2010 is going to be...
hc_appattach(hc_app) hc_fit.o1
hc_fit.f1hc_fit.o2hc_fit.f2
plot(as.Date(Dates),Oppose,
main="Public opinion and health care reform",
ylim=c(0,80),pch=16,
xlim=c(as.Date("2009-01-01"),as.Date("2009-11-01")),
cex.axis=.85, col="#E6ADD8",
xlab="",ylab="Percentage approving or opposing") points(as.Date(Dates),
Favor,pch=16,col="#ADD8E6")
lines(hc_fit.f1,col="blue",lwd=2)
lines(hc_fit.o1,col="red",lwd=2)
lines(hc_fit.f2,col="blue",lwd=2,lty=3)
lines(hc_fit.o2,col="red",lwd=2,lty=3)
abline(h=50,lwd=.5,lty=3,col="#555555")
hc_appattach(hc_app) hc_fit.o1
hc_fit.f1hc_fit.o2hc_fit.f2
plot(as.Date(Dates),Oppose,
main="Public opinion and health care reform",
ylim=c(0,80),pch=16,
xlim=c(as.Date("2009-01-01"),as.Date("2009-11-01")),
cex.axis=.85, col="#E6ADD8",
xlab="",ylab="Percentage approving or opposing") points(as.Date(Dates),
Favor,pch=16,col="#ADD8E6")
lines(hc_fit.f1,col="blue",lwd=2)
lines(hc_fit.o1,col="red",lwd=2)
lines(hc_fit.f2,col="blue",lwd=2,lty=3)
lines(hc_fit.o2,col="red",lwd=2,lty=3)
abline(h=50,lwd=.5,lty=3,col="#555555")
R is a free, cross-platform, open-source statistical analysis language and program. It is also an alternative to expensive commercial statistics software such as SPSS. The environment for R differs from the typical point and click interface found in mo...
Earlier today the 33rd Chicago Marathon was held. I will organise my comments by pointing out three epic fails.
First, of course, was the Chicago weather. After two successive marathon in excessive heat --- the 2007 race I completed, poorly, with its thousands of runners forced to abandon when the race was cancelled due to excessive heat, and the 2008 version which...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
