Publications by Pradeep Mavuluri
Easy way of determining number of lines/records in a given large file using R
Dear Readers,Today I would like to post the easy way of determining number of lines/records in any given large file using R.Directly to point.1) If data set is small let say less than 50MB or around in R one can read it with ease using: length(readLines(“xyzfile.csv”))2) But if data set is too large say more than 1GB then read...
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Knowing whether a time-series has been differenced appropriately in order to make it stationary
Hello everybody,Today I would like to make you learn a simple method (and of-course using R) how to identify whether a time-series has been differenced appropriately while making it stationary.Suppose, you have made a series stationary by differencing it, now in order to know whether it is neither over nor under differenced subject the current se...
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Usage of R functions "table" & "ifelse" when NA’s exist
Most of the time I came across now and then in help posts questions regarding the mismatching total count of observations after employing the R functions “table” and “ifelse”. This usually creates frustration among fresh/part-time practitioners which ends up doubting the application and reverting back to their earlier tool.How...
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A view on R Capabilities
Dear R Programmers,I have tried to capture R capabilites in a single slide. I welcome your comments/suggestions on the same. Related To leave a comment for the author, please follow the link and comment on their blog: Econometrics_Help. R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many...
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Read Big Text Files Column by Column
Dear R Programmers,There is new package “colbycol” on CRAN, which makes our jobs easier when we have large files i.e. more than a GB to be read in R. Especially, when we don’t need all of the columns/variables for our analysis. Kudos for author, Carlos J. Gil Bellosta.I have tried it on a 1.72 GB data, where in my main interest ...
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Preview version of RStudio 0.97 is now available
Rstudio has changed its website extension from rstudio.org to rstuido.com/ide and kept its new preveiw version at below link, few new things as “package development” tools are included in this version that makes job easy to develop new package.http://www.rstudio.com/ide/download/previewEnjoy R programming. Related To leave a ...
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R (Web Server) Solutions – Amplifying Artichokes
Every month I see one or more new R based web server solutions coming into the market, sight seeing some of them thought of sharing one of my old architecture map manifested to the client long back in early 2009 (good to see quick spreading of scalable and customizable open source statistical computing tool in the market). Related To leave a co...
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Analysis of HR Emails
This study has made an attempt to understand, what HR’s in a day dealt with at different working hours, by analyzing their emails from a particular organization. Sample size of the study consists of 7 HRs emails who are located at two different locations of the same organization in a country and for 15 different days that are select...
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Is data mining more about fitting data well? – Exercise Results
Today, I am going to share results of an exercise that I carried out recently for a start-up. Intention of the study was to extract those major attributes that are generally driving less/in experienced (or) re-skilled data miners towards the given objective and to understand where they are failing back. Herein, twist is majority of them have give...
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"R" in Top 20 of TIOBE Index
Dear R programmers,In this May (2015), our favorite “R” almost came to 12th position in the popular TIOBE Programming Community Index (TIOBE Index), however, it is experienced some volatility after that and couldn’t move further to top 10. Currently, it holds 19th rank (for this month); wishing it retains its position in top 20 through the...
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