Monthly Archives: June 2013

How to read quickly large dataset in R?

June 9, 2013
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Medal Allocations at the Comrades Marathon

June 9, 2013
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Medal Allocations at the Comrades Marathon

Following up on my previous post regarding attrition rates at Comrades Marathon 2013, here are the statistics I have gathered for medal allocations. There is some interesting history behind the Comrades Marathon medals. For reference, the medals are allocated as follows: Gold medals to the first ten finishers in the men’s race and the ladies’ race;

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Exploratory Data Analysis: Kernel Density Estimation in R on Ozone Pollution Data in New York and Ozonopolis

Exploratory Data Analysis: Kernel Density Estimation in R on Ozone Pollution Data in New York and Ozonopolis

Introduction Recently, I began a series on exploratory data analysis; so far, I have written about computing descriptive statistics and creating box plots in R for a univariate data set with missing values.  Today, I will continue this series by analyzing the same data set with kernel density estimation, a useful non-parametric technique for visualizing

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Quartiles, Deciles, and Percentiles

June 9, 2013
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The measures of position such as quartiles, deciles, and percentiles are available in quantile function. This function has a usage,where:x - the data pointsprob - the location to measurena.rm - if FALSE, NA (Not Available) data points are not ignoredna...

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Estimating Finite Mixture Models with Flexmix Package

June 9, 2013
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Estimating Finite Mixture Models with Flexmix Package

In my post on 06/05/2013 (http://statcompute.wordpress.com/2013/06/05/estimating-composite-models-for-count-outcomes-with-fmm-procedure), I’ve shown how to estimate finite mixture models, e.g. zero-inflated Poisson and 2-class finite mixture Poisson models, with FMM and NLMIXED procedure in SAS. Today, I am going to demonstrate how to achieve the same results with flexmix package in R. R Code R Output for 2-Class Finite Mixture

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Quick and Simple D3 Network Graphs from R

June 8, 2013
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Quick and Simple D3 Network Graphs from R

Sometimes I just want to quickly make a simple D3 JavaScript directed network graph with data in R. Because D3 network graphs can be manipulated in the browser–i.e. nodes can be moved around and highlighted–they're really nice for data exploration. They're also really nice in HTML presentations. So I put together a...

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Mean and Median

June 8, 2013
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Mean in R is computed using the function mean. Consider the scores of 20 MSU-IIT students in Stat 101 exam with a hundred items: 70, 78, 66, 65, 50, 53, 48, 88, 95, 80, 85, 84, 81, 63, 68, 73, 75, 84, 49, and 77. Compute and interpret the mean and medi...

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Using Metadata to find Paul Revere

June 8, 2013
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Using Metadata to find Paul Revere

London, 1772. I have been asked by my superiors to give a brief demonstration of the surprising effectiveness of even the simplest techniques of the new-fangled Social Networke Analysis in the pursuit of those who would seek to undermine the liberty enjoyed by His Majesty’s subjects. This is in connection with the discussion of the role of “metadata” in

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Using Metadata to find Paul Revere

June 8, 2013
By
Using Metadata to find Paul Revere

London, 1772. I have been asked by my superiors to give a brief demonstration of the surprising effectiveness of even the simplest techniques of the new-fangled Social Networke Analysis in the pursuit of those who would seek to undermine the liberty enjoyed by His Majesty’s subjects. This is in connection with the discussion of the role of “metadata” in

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Bulk search for domain names using R

June 8, 2013
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# There are several domain name servers that allow # for bulk searching of domain names.# http://www.godaddy.com/bulk-domain-search.aspx# http://www.namestation.com/bulk-domain-search# However, they do not provide any wildcard support # and instead exp...

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