# 3245 search results for "git"

## Citations in markdown using knitr

March 24, 2012
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I am finding myself more and more drawn to markdown rather then tex/Rnw as my standard format (not least of which is the ease of displaying the files on github, particularly now that we have automatic image uploading). One thing I miss from latex is the citation commands. (I understand these can be provided to

## R script to calculate QIC for Generalized Estimating Equation (GEE) Model Selection

March 23, 2012
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Generalized Estimating Equations (GEE) can be used to analyze longitudinal count data; that is, repeated counts taken from the same subject or site. This is often referred to as repeated measures data, but longitudinal data often has more repeated obse...

## R script to calculate QIC for Generalized Estimating Equation (GEE) Model Selection

March 23, 2012
By

Generalized Estimating Equations (GEE) can be used to analyze longitudinal count data; that is, repeated counts taken from the same subject or site. This is often referred to as repeated measures data, but longitudinal data often has more repeated observations. … Continue reading →

## Gini Efficient Frontier

March 23, 2012
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$Gini Efficient Frontier$

David Varadi have recently wrote two posts about Gini Coefficient: I Dream of Gini, and Mean-Gini Optimization. I want to show how to use Gini risk measure to construct efficient frontier and compare it with alternative risk measures I discussed previously. I will use Gini mean difference risk measure – the mean of the difference

## RStudio Development Environment

March 23, 2012
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Compared to many other languages of equal popularity, there are realtively few development environments for R. In fact, the total number of production ready R IDEs could probably be counted on one hand. That deficiency is a small price to pay to use R and if you’re not already accustomed to using IDEs for other The post RStudio...

## Project Euler: Problem 20

March 22, 2012
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n! means n x (n - 1) x ... x 3 x 2 x 1For example, 10! = 10 x 9 x ... x 3 x 2 x 1 = 3628800,and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.Find the sum of the di...

## Tracking SFO Airport’s Performance Using R, HANA and D3

March 22, 2012
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This is my first introduction to D3 and I am simply blown away.  Mike Bostock (@mbostock), you are genius and thanks for creating D3!  With HANA, R, D3, HTML5 and iPad, and you got yourself a KILLER combo!I have been burning my midnight oil o...

## Using R for a salary negotiation–an extension of decision tree models

March 21, 2012
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Let’s say you are in the middle of a salary negotiation, and you want to know whether you should be aggressive in your offering or conservative. One way to help with the decision is to make a decision tree. We’ll work with the following assumptions: You are at a job currently making \$50k You have the choices between...

## mvabund – new R pkg for multivariate abundance data

March 19, 2012
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There is a new R package in town, mvabund, which does, as they say "statistical methods for analysing multivariate abundance data". The authors introduced the paper in an online early paper in Methods in Ecology and Evolution here, R package here.Th...

## Backtesting Asset Allocation portfolios

March 18, 2012
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$Backtesting Asset Allocation portfolios$

In the last post, Portfolio Optimization: Specify constraints with GNU MathProg language, Paolo and MC raised a question: “How would you construct an equal risk contribution portfolio?” Unfortunately, this problem cannot be expressed as a Linear or Quadratic Programming problem. The outline for this post: I will show how Equal Risk Contribution portfolio can be