1747 search results for "Excel"

Python vs R vs SPSS … Can’t All Programmers Just Get Along?

March 26, 2013
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Python vs R vs SPSS … Can’t All Programmers Just Get Along?

Programmers have long been very proud and loyal with their tools, and often very vocal. This has led to well-contested rivalries and "fights" about which tool is better: emacs or vi; Java or C++; Perl or Python; Django or Rails; and, for data geeks, the SAS/SPSS/R/Matlab fight. The truth is, very few of us data geeks (data scientists, data analysts, statisticians, or...

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Rcpp 0.10.3

March 23, 2013
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A new relase 0.10.3 of Rcpp is now on CRAN and in Debian. This is the fourth release in the 0.10.* series, and further extends and solidifies the excellent Rcpp attributes. A few other bugs were fixed as well, and support for wide character string...

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Maximum Sharpe Portfolio

March 21, 2013
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Maximum Sharpe Portfolio

Maximum Sharpe Portfolio or Tangency Portfolio is a portfolio on the efficient frontier at the point where line drawn from the point (0, risk-free rate) is tangent to the efficient frontier. There is a great discussion about Maximum Sharpe Portfolio or Tangency Portfolio at quadprog optimization question. In general case, finding the Maximum Sharpe Portfolio

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XLConnect on github

March 20, 2013
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XLConnect on github

Mirai Solutions GmbH (http://www.mirai-solutions.com) is pleased to announce the availability of XLConnect on github. Whether you want to browse the code or simply want access to the latest development version of XLConnect, visit us on github. XLConnect can be directly … Continue reading →

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On the acceptance of R

March 20, 2013
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Some history and a prediction. Past A discussion broke out on the R-help mailing list in January 2006 about a technical report put out by the statistical computing group at UCLA.  The report in question talked mainly about SAS, SPSS and Stata.  It talked briefly — and not especially positively — about R.  Someone accused The post On...

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Behavioral Economics and Beer… highly correlated

March 19, 2013
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Behavioral Economics and Beer… highly correlated

Short: I plot the frequency of wikipedia searches of “Behavioral Economics”, and “Beer” – who knew the correlation would be 0.7! Data reference:Data on any wikipedia searches (back to 2007) are available at http://glimmer.rstudio.com/pssguy/wikiSearchRates/. The website allows you to download frequency hits per day as a csv, which is what I've done here....

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Samsung Phone Data Analysis Project

March 19, 2013
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Samsung Phone Data Analysis Project

Below are my findings from the second data analysis project in Dr. Jeffery Leek’s John Hopkins Coursera class. Introduction I used the  “Human Activity Recognition Using Smartphones Dataset” (UCI, 2013) to build a model. This data  was recorded from a Samsung prototype smartphone with a built-in accelerometer. The purpose of my model was to recognize the type

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column-store R or: how i learned to stop worrying and love monetdb

March 18, 2013
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"Combining R's sophisticated calculations and MonetDB's excellent data access performance is a no-brainer. One gets the best of two (open source) worlds with minimal hassle." - Dr. Hannes Mühleisen"oh wow that was fast like a cheetah with a jetpack or something" - anthony damicowhy try monetdb + ra speed test of four analysis commands on sixty-seven million...

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Ordinal Data

March 17, 2013
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Ordinal Data

I expect to be getting some ordinal data, from 5 or 9 point rating scales, pretty soon, so I am having a look ahead how to treat those. Often ANOVA is used, even though it is well known not to be ideal fro a statistical point of view, so that is the st...

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Evaluation of Orthogonal Signal Correction for PLS modeling (OSC-PLS and OPLS)

March 15, 2013
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Evaluation of Orthogonal Signal Correction for PLS modeling (OSC-PLS and OPLS)

Partial least squares projection to latent structures or PLS is one of my favorite modeling algorithms. PLS is an optimal algorithm for predictive modeling using wide data or data with  rows << variables. While there is s a wealth of literature regarding the application of PLS to various tasks, I find it especially useful for biological

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