1270 search results for "excel"

Computing Odds Ratios in R

Computing Odds Ratios in R

In my last post, I discussed the use of odds ratios to characterize the association between edibility and binary mushroom characteristics for the mushrooms characterized in the UCI mushroom dataset.  I did not, however, describe those co...

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sab-R-metrics: Logistic Regression

May 5, 2011
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sab-R-metrics: Logistic Regression

It's been a while since my last sab-R-metrics post, and I have not gotten to the real fun stuff yet. I apologize for the long layoff, and it's likely that these will be sparse for the next couple weeks. I have had some consulting opportunities come u...

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sab-R-metrics: Logistic Regression

May 5, 2011
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sab-R-metrics: Logistic Regression

It's been a while since my last sab-R-metrics post, and I have not gotten to the real fun stuff yet. I apologize for the long layoff, and it's likely that these will be sparse for the next couple weeks. I have had some consulting opportunities come u...

Read more »

bigkmeans also works well for ordinary matrix objects: The biganalytics package

May 4, 2011
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bigkmeans also works well for ordinary matrix objects: The biganalytics package

The bigmemory is an excellent package for handling big matrix in R. There are several sister packages provided by "The Bigmemory Project": biganalytics for analysis, bigtabulate for tabulation, bigalgebra for linear algebra functionality, synchronicity...

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bigkmeans also works well for ordinary matrix objects: The biganalytics package

May 4, 2011
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bigkmeans also works well for ordinary matrix objects: The biganalytics package

The bigmemory is an excellent package for handling big matrix in R. There are several sister packages provided by "The Bigmemory Project": biganalytics for analysis, bigtabulate for tabulation, bigalgebra for linear algebra functionality, synchronicity for synchronization via mutexes and interprocess communication and message passing.biganalytics provides a few functions for analysis: linear regression model, generalized linear regression model, and...

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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

May 3, 2011
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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

I recently discovered the mtable() command in the memisc library and its use with toLatex() to produce nice summary output for lm and glm objects in a nicely formatted table like this:Once you have your linear model objects, all you need is one command...

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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

May 3, 2011
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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

I recently discovered the mtable() command in the memisc library and its use with toLatex() to produce nice summary output for lm and glm objects in a nicely formatted table like this:Once you have your linear model objects, all you need is one command...

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Estimate Gene Diversity

May 3, 2011
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Estimate Gene Diversity

I provide here an R function to estimate gene diversity of diallelic sites (e.g. SNPs), given allele frequencies at each segregating site. The function takes three input parameters: maf: a numeric value (or vector) representing minor allele frequency at each site. Default is 0.5 nreads: size of each resampling experiment. Default is 10000. nreplicates: Number

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Ecological SEMs and Composite Variables: What, Why, and How

May 2, 2011
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Ecological SEMs and Composite Variables: What, Why, and How

I’m a HUGE fan of Structural Equation Modeling. Heck, I’ve even begun teaching short SEM workshops. (seriously, if you want, email me and we’ll talk). For those of you unfamiliar with the technique, it’s awesome for three main reasons. It’s a method of teasing apart direct and indirect interactions in your data. It allows you

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Introducing R in the Enterprise

May 2, 2011
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Introducing R in the Enterprise

We've introduced R in the organization!It is running along with the heavy weights of statistical analysis like SAS, SPSS, Matlab. Here's what we did and how we did it...HOW DID IT START?I started learning R last year and loved its simplicity and power....

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