# 3247 search results for "git"

## FloraWeb Plant Species Report via R

June 10, 2012
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For German-spoken users I added the function floraweb_scrape.R that allows you to conveniently collect species data and print to a PDF-file (see this example output). The function accesses data provided by the  web-site FloraWeb.de (BfN - Bundesministerium für Naturschutz).You can use it as an interactive version (RTclTk) which I have put to a Github repository

## Testing recommender systems in R

June 10, 2012
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$Testing recommender systems in R$

Recommender systems are pervasive. You have encountered them while buying a book on barnesandnoble, renting a movie on Netflix, listening to music on Pandora, to finding the bar visit (FourSquare). Saar for Revolution Analytics, had demonstrated how to get started with some techniques for R here. We will build some using Michael Hahsler’s excellent package

## ggplot2: Creating a custom plot with two different geoms

June 9, 2012
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This past week for work I had to create some plots to show the max, min, and median of a measure across the levels of a qualitative variable, and show the max and min of the same variable within a … Continue reading →

## Rcpp vs. R implementation of cosine similarity

June 9, 2012
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While speeding up some code the other day working on a project with a colleague I ended up trying Rcpp for the first time. I re-implemented the cosine distance function using RcppArmadillo relatively easily using bits and pieces of code I found scattered around the web. But the speed increase was not as much as I expected comparing the...

## Project Euler — problem 8

June 9, 2012
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The eight problem of Project Euler: Find the greatest product of five consecutive digits in the 1000-digit number. … The solution is as straightforward as the problem, although the 1000-digit number needs some format changes before product calculation. ?View Code … Continue reading →

## knitr Performance Report 4

June 8, 2012
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please see knitR Performance Report 3 (really with knitr) and dprint, knitr Performance Report–Attempt 3, knitr Performance Report-Attempt 2 and knitr Performance Report-Attempt 1 Here is another iteration of the ongoing performance reporting attempt...

## Evaluation of Tactical Approaches

June 8, 2012
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Tactical approaches are often chosen based on the best cumulative return which implicitly incorporates significant hindsight bias.  Just because an approach dominates for a period of time does not indicate that it will be the best approach.  ...

## UK house prices visualised with googleVis-0.2.16

June 5, 2012
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A new version of googleVis has been released on CRAN and the project site. Version 0.2.16 adds the functionality to plot quarterly and monthly data as a motion chart. To illustrate the new feature I looked for a quarterly data set and stumbled across t...

## Volatility Quantiles

June 4, 2012
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Today I want to examine the performance of stocks in the S&P 500 grouped into Quantiles based on one year historical Volatility. The idea is very simple: each week we will form Volatility Quantiles portfolios by grouping stocks in the S&P 500 into Quantiles using one year historical Volatility. Next we will backtest each portfolio