Articles by Kay Cichini

A Little Webscraping-Exercise…

October 22, 2011 | Kay Cichini

In R it's quite easy to pull out anything from a webpage and I'll show a little exercise in doing so.Here I retrieve all blog addresses from R-bloggers by the function readLines() and some subsequent data processing.Read more »
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Plot Animation with Imported Images

October 10, 2011 | Kay Cichini

...I really dig the animation package! ..so here's the outcome of my firsts encounters with saveHTML() - I produced an animation with pre-existing images by utilizing the functions readJPEG() and rasterImage() from the R-packages jpeg and ReadImage...
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Comparing Two Distributions

August 29, 2011 | Kay Cichini

Here I compare two distributions, flowering duration of indigenous and allochtonous plant species. The hypothesis is that alien compared to indigenous plant species exhibit longer flowering periods. Read more » [Read more...]

Drawing Grids in R

June 1, 2011 | Kay Cichini

Here's an example of how to draw a grid in R and how to fill it.I did use the grid-package and its functions for displaying species cover values at squares of a recording frame...Read more »
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Summarize Data by Several Variables

May 23, 2011 | Kay Cichini

Here's an example how to conveniently summarize data with the cast function (package reshape). By the way you see how this could be done "in-conveniently" by hand. You also see how a for-loop works and how a matrix is constructed and fill...
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Adonis (PERMANOVA) – Assumptions

April 26, 2011 | Kay Cichini

Before you use PERMANOVA (R-vegan function adonis) you should read the user notes for the original program by the author (Marti J. Anderson) who first came up with this method. An important assumtption for PERMANOVA is same "multivariate spread&qu...
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