Articles by Kay Cichini

Playing with knitr: Create Report with Dynamic List

May 1, 2012 | Kay Cichini

Here is a little toy example using knitr, LaTeX/MiKTeX and Google Docs.Say you had a list on Google Docs (say a list of attendants) and you want to print a report with it..Then see this example using this Rnw-file and the output...make the tex-file wit... [Read more...]

Quick Tip: Replace Values in Dataframe on Condition with Random Numbers

May 1, 2012 | Kay Cichini

This one took me some time - though, in fact it is plain simple:__ options(scipen=999)__ (my_df X1 X2 X3 X4 X5 X6 X7 X8 X9 X101 0 0 1 0 1 1 1 1 0 12 0 0 1 1 1 0 0 0 0 03 0 1 1 0 0 1 1 0 0 14 1 1 0 0 0 0 0 0 0 05 0 0 1 1 1 0 0 1 1 16 0 0 1 1 0 0 1 1 0 17 0 0 1 1 1 0 1 1 1 18 1 1 1 0 0 0 0 1 1 09 0 0 0 0 1 0 1 0 1 010 1 1 1 1 1 0 1 1 0 1__ my_df[my_df == 0] __ my_df X1 X2 X3 X4 X5 X6 X7 X81 0.000268 0.000926 1.000000 2.00e-05 1.000000 1.00e+00 1.00e+00 1.00e+002 0.000531 0.000882 1.000000 1.00e+00 1.000000 4.66e-04 3.96e-04 6.70e-043 0.000785 1.000000 1.000000 5.03... [Read more...]

Reproducible Research: Running odfWeave with 7-zip

April 25, 2012 | Kay Cichini

odfWeave is an R-package that is used for making dynamic reports by Sweave processing of Open Document Format (ODF) files. For anyone new to report generation and lacking knowledge of markup languages this might be a good starting point or even a true ... [Read more...]

Reproducible Research: Export Regression Table to MS Word

April 20, 2012 | Kay Cichini

Here's a quick tip for anyone wishing to export results, say a regression table, from R to MS Word:require(R2wd)# install packages required# install software RCOM, RDCOMClient # (I had to restart the R-Session after the above step to get it work)wdGet(... [Read more...]

R-Bloggers’ Web-Presence

April 6, 2012 | Kay Cichini

We love them, we hate them: RANKINGS!Rankings are an inevitable tool to keep the human rat race going. In this regard I'll pick up my last two posts (HERE & HERE) and have some fun with it by using it to analyse R-Bloggers' web presence. I will use... [Read more...]

A Little Web Scraping Exercise with XML-Package

April 5, 2012 | Kay Cichini

Some months ago I posted an example of how to get the links of the contributing blogs on the R-Blogger site. I used readLines() and did some string processing using regular expressions.With package XML this can be drastically shortened - see this:# get... [Read more...]

Playing with XML-Package: Get No. of Google Search Hits with R

March 30, 2012 | Kay Cichini

GoogleHits

[Read more...]

Applying Same Changes to Multiple Dataframes

March 28, 2012 | Kay Cichini

How to apply the same changes to several dataframes andsave them to CSV: # a dataframea

[Read more...]

How to Extract Citation from a Body of Text

March 26, 2012 | Kay Cichini

Say, you have a text and you want to retrieve the cited names and years of publication. You wouldn't want to this by hand, wouldn't you?Try the following approach:(the text sample comes from THIS freely available publication)library(stringr)(txt

[Read more...]

Classification Trees and Spatial Autocorrelation

March 25, 2012 | Kay Cichini

I'm currently trying to model species presence / absence data (N = 523) that were collected over a geographic area and are possibly spatially autocorrelated. Samples come from preferential sites (sea level __ 1200 m, obligatory presence of permanent ...

[Read more...]

Custom Summary Stats as Dataframe or List

March 24, 2012 | Kay Cichini

On Stackoverflow I found this useful example on how to apply custom statistics on a dataframe and return the results as list or dataframe:somedata

[Read more...]

Creating a Stratified Random Sample of a Dataframe

March 14, 2012 | Kay Cichini

Expanding on a question on Stack Overflow I'll show how to make a stratified random sample of a certain size: d

[Read more...]

R-Function to Read Data from Google Docs Spreadsheets

March 13, 2012 | Kay Cichini

I used this idea posted on Stack Overflow to plug together a function for reading data from Google Docs spreadsheets into R. google_ss

[Read more...]

Apprentice Piece with Lattice Graphs

February 28, 2012 | Kay Cichini

Lattice graphs can be quite tedious. I don't use them too often and when I need them I usually have to dig the archives for the parameter-details.The here presented example may serve as a welcome template for the usage of panel functions, panel o...

[Read more...]

Testing the Effect of a Factor within each Level of another Factor with R-Package {contrast}

February 27, 2012 | Kay Cichini

This is a small example of how custom contrasts can easily be applied with the contrast-package. The package-manual has several useful explanations and the below example was actually grabbed from there.This example can also be applied to a GLM but I ch...

[Read more...]

Transformation of Several Variables in a Dataframe

February 1, 2012 | Kay Cichini

This is how I transform several columns of a dataframe, i.e., with count-data into binary coded data (this would apply also for any other conversion..).count1

[Read more...]

A Short Example with R-Package osmar..

January 26, 2012 | Kay Cichini

Following up my last post in which I praised the capabilities of the osmar-package I give a short example...ps: You can also find this example at GitHub HERE.library(osmar) # this pulls the data from the OSM-Api:mydistrict

[Read more...]

osmar – Don’t Miss this New R-Geo-Package!

January 26, 2012 | Kay Cichini

The osmar-package enables you to retrieve all geographic elements of OpenStreetMap via its API.I.e., you can retrieve a street, river, state-boundary or whatever and use this as a spatial object in R.It's overwhelming thinking of the endless playg...

[Read more...]

R-Function to Source all Functions from a GitHub Repository

January 1, 2012 | Kay Cichini

Here's a function that sources all scripts from an arbitrary github-repository. At the moment the function downloads the whole repo and sources functions kept in a folder named "Functions" - this may be adapted for everyones own purpose.# Script name: ...

[Read more...]

Blog Statistics with StatCounter & R

December 19, 2011 | Kay Cichini

If you're interested in analysing your blog's statistics this can easily be done with a web-service like StatCounter (free, only registration needed, quite extensive service) and with R.After implementing the StatCounter script in the html code of a we...

[Read more...]

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Articles by Kay Cichini

Playing with knitr: Create Report with Dynamic List

Quick Tip: Replace Values in Dataframe on Condition with Random Numbers

Reproducible Research: Running odfWeave with 7-zip

Reproducible Research: Export Regression Table to MS Word

R-Bloggers’ Web-Presence

A Little Web Scraping Exercise with XML-Package

Playing with XML-Package: Get No. of Google Search Hits with R

Applying Same Changes to Multiple Dataframes

How to Extract Citation from a Body of Text

Classification Trees and Spatial Autocorrelation

Custom Summary Stats as Dataframe or List

Creating a Stratified Random Sample of a Dataframe

R-Function to Read Data from Google Docs Spreadsheets

Apprentice Piece with Lattice Graphs

Testing the Effect of a Factor within each Level of another Factor with R-Package {contrast}

Transformation of Several Variables in a Dataframe

A Short Example with R-Package osmar..

osmar – Don’t Miss this New R-Geo-Package!

R-Function to Source all Functions from a GitHub Repository

Blog Statistics with StatCounter & R

Articles by Kay Cichini

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