# 2919 search results for "git"

## Use case: combining taxize and rgbif

November 1, 2011
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Sure thing….this is just the sort of thing for which rOpenSci is being built. A colleague of mine recently saw our packages in development and thought, “Hey, that could totally make my life easier.”   What was made easier you ask?   This was his situation: He had a list of ca. 1200 species of

## Code Optimization: One R Problem, Ten Solutions – Now Eleven!

November 1, 2011
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Earlier this year I came across a rather interesting page about optimisation in R from rwiki. The goal was to find the most efficient code to produce strings which follow the pattern below given a single integer input n: From this we can see that the general pattern for n is: It is rather heart

## Minimizing Downside Risk

November 1, 2011
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$Minimizing Downside Risk$

In the Maximum Loss and Mean-Absolute Deviation risk measures, and Expected shortfall (CVaR) and Conditional Drawdown at Risk (CDaR) posts I started the discussion about alternative risk measures we can use to construct efficient frontier. Another alternative risk measure I want to discuss is Downside Risk. In the traditional mean-variance optimization both returns above and

## How Might Data Journalists Show Their Working? Sweave

November 1, 2011
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If part of the role of data journalism is to make transparent the justification behind claims that are, or aren’t, backed up by data, there’s good reason to suppose that the journalists should be able to back up their own data-based claims with evidence about how they made use of the data. Posting links to

## Project Euler-Problem 38

November 1, 2011
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Take the number 192 and multiply it by each of 1, 2, and 3: 192 × 1 = 192 Read More: 450 Words Totally

## Making R’s paste act more like CONCAT

October 31, 2011
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While vector-friendly, R's paste function has a few behaviors I don't particularly like. One is using a space as the default separator:> adjectives> paste(adjectives,"er")> paste(adjectives,"er") "lean er" "fast er" "strong er" #d'oh> paste(adjectives,"er",sep="") "leaner" "faster" "stronger"Empty vectors get an undeserved first class treatment: > paste(indelPositions,"i",sep="") "i"> indelPositions> paste(indelPositions,"i",sep="") "5i"...

## Modelling with R: part 5

October 30, 2011
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In our exercise of learning modelling in R, we have till now succeeded in doing the following:Importing the dataPreparing and transforming the dataRunning a logistic regressionCreating a decision treeSpecifically, we created a decision tree using the r...

## R-TreeBASE Tutorial

October 28, 2011
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My treebase package is now up on the CRAN repository. (Source code is up, the binaries should appear soon). Here’s a few introductory examples to illustrate some of the functionality of the package. Thanks in part to new data deposition … Continue reading →

## Creating an R package, using developer/productivity tools

October 27, 2011
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Couple of R programming (mainly infrastructure/workflow) related topics discussed at the Los Angeles R users group in a tutorial/demo-like form (targeted mainly to beginners) by Szilard Pafka and Jeroen Ooms: how easy it is to create a simple package for … Continue reading →