Blogs about: Gnu R
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ave
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vikasrawal wrote 9 months ago: See this post at its new location I discovered a new, very useful, R function yesterday: ave. This i … more →
"relevel" factors when using them to create dummy variables
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vikasrawal wrote 2 years ago: ?relevel : The levels of a factor are re-ordered so that the level specified by ‘ref’ is … more →
Working with ggplot, version 2
vikasrawal wrote 2 years ago: In my previous post on this issue, I had presented a code that made weighted boxplots and annotated … more →
simple.scatterplot: Two way distributions
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vikasrawal wrote 2 years ago: John Verzani’s book has a title page that shows a scatterplot with histograms of x and y varia … more →
Working with ggplot
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vikasrawal wrote 2 years ago: Hadley Wickham’s ggplot is a very interesting package. It makes beautiful graphics, integrates … more →
Dropping columns in subset command
vikasrawal wrote 2 years ago: Use “select=c(var1,var2)” in the subset command to select var1 and var2. Use “sele … more →
Page orientation problem in converting postscript files to pdf using ps2pdf
vikasrawal wrote 2 years ago: A commonly reported problem with ps2pdf is that it does not always guess the page orientation right. … more →
Statistics on Microsoft Excel
vikasrawal wrote 2 years ago: Here is an interesting document on problems of using Microsoft Excel for statistical analysis. http: … more →
Superimposing two plots
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vikasrawal wrote 2 years ago: If you want to give two plot commands, and do not want the second one to wipe out the first one, do … more →
scatterplot.matrix
vikasrawal wrote 2 years ago: John Fox’s package, “car”, has a very useful scatterplot.matrix (or simply spm) to … more →
jitter
vikasrawal wrote 2 years ago: jitter is an interesting function that adds a small noise to a vector. A very useful feature if you … more →
Replacing selected values of variables
vikasrawal wrote 4 years ago: You can replace selected values of variables in a dataframe (or any other r object) by using the fun … more →
Reading data from microsoft access files in linux
vikasrawal wrote 2 years ago: Some of the Census 2001 data are in microsoft access files (having filename extensions .mdb). A micr … more →
Graphics (base, grid and lattice) in RNews
vikasrawal wrote 2 years ago: R News 2(2) has papers on grid and lattice packages. R News 3(2) has papers on base, grid and gridBa … more →
Renaming variables in a dataframe
vikasrawal wrote 2 years ago: There is no direct command in R for renaming variables and that may make it less than obvious for so … more →
Area under curve
vikasrawal wrote 2 years ago: There are various ways in which you can get R to calculate area under a curve. Some of these are exp … more →
Postscript graphics from R
vikasrawal wrote 2 years ago: Graphics made in R are best saved as postscript files if the files are to be used for printing. This … more →
Use reshape to tabulate
vikasrawal wrote 2 years ago: Package reshape is meant for aggregating, reshaping and tabulating data.Tabulation is done in two st … more →
List of variables in a dataframe
vikasrawal wrote 2 years ago: Function “names” gives list of columns/variables in a dataframe. … more →
