Monthly Archives: August 2013

analyze the national longitudinal study of adolescent health (addhealth) with r

August 26, 2013
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the national longitudinal survey of adolescent health (addhealth) is to the health and retirement study what teen people is to aarp magazine.  both surveys have followed a cohort of respondents for almost twenty years now, asking them health behav...

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Use Fluid On MacOS To Build Per-RStudio Server “Dedicated” Clients

August 25, 2013
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Use Fluid On MacOS To Build Per-RStudio Server “Dedicated” Clients

I’m jumping around analytics environments these days and have to leave the comfort of my Mac’s RStudio Desktop application to use various RStudio Server instances via browser. While I prefer to use Chrome, the need to have a “dedicated” RStudio Server client outweighs the utility of my favorite browser. This is where Fluid (@FluidApp by

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GDAT Class October 14-18, 2013

August 25, 2013
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GDAT Class October 14-18, 2013

This is your fast track to enterprise performance analysis and capacity planning with an emphasis on applying R statistical tools to your performance data. Early-bird discounts are available for the Level III Guerrilla Data Analysis Techniques class O...

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RSiteCatalyst Version 1.1 Release Notes

August 25, 2013
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RSiteCatalyst version 1.1 is now available on CRAN. Changes from version 1 include: Support for Correlations/Subrelations in the QueueRanked function Support for Current Data in all ‘Queue‘ functions Support Anomaly Detection for QueueOvertime and QueueTrended functions (example usage with ggplot2 graph) Decrease in wait time for API calls (from 5 seconds to 2 seconds) and extending RSiteCatalyst Version 1.1...

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Non-linear regression in R

August 25, 2013
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Non-linear regression in R

Here is the link to the article: http://rpubs.com/hughes/7812 There you will discover how to simulate and fit: power function, Michaelis-Menten equation and sigmoid curves in R, the fit is done by least-square using the ‘nls’ function.Filed under: R and Stat Tagged: NLS, R

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More REML exercise

August 25, 2013
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Last week I tried exercise 1 of the SAS(R) proc mixed with R libraries lme4 and MCMCglm. So this week I aimed for exercise 2 but ended up redoing exercise 1 with nlme.Exercise 2 results gave me problems with library lme4 and latter parts of the ex...

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From SVG to probability distributions [with R package]

August 25, 2013
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From SVG to probability distributions [with R package]

Hey, To illustrate generally complex probability density functions on continuous spaces, researchers always use the same examples, for instance mixtures of Gaussian distributions or a banana shaped distribution defined on with density function: If we draw a sample from this distribution using MCMC we obtain a plot like this one: Clearly it doesn’t really look

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The Wonders of foreach

August 25, 2013
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The Wonders of foreach

Writing code from scratch to do parallel computations can be rather tricky. However, the packages providing parallel facilities in R make it remarkably easy. One such package is foreach. I am going to document my trail of discovery with foreach, which began some time ago, but has really come into fruition over the last few

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Using R in Used Car Search

August 24, 2013
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Using R in Used Car Search

Recently I was looking to buy a used car. I was using the Edmunds website to estimate the true market value of a used car. It has a nice click through interface where it guides you to input make, model, … Continue reading →

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Exporting Results of Linear Regression with Robust Standard Errors

August 24, 2013
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