Publications by Kay Cichini
Drawing Grids in R
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 » Related To leave a comment for the author, please follow the link and comment on their blog: theBioBucket*. R-bloggers.com offers daily e-mail updates a...
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Multiple Comparisons for GLMMs using glmer() & glht()
…that's an example of how to apply multiple comparisons to a generalised linear mixed model using the function glmer from package lme4 & glht() from package multcomp. By the way you see a nice example for visualizing data from a nested sampling design with lattice-plots! Read more » Related To leave a comment for the author, please follow t...
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Lattice-xyplot without Border/Box, with Axes at Bottom & Left Side Only, with Custom Ablines/Grid & Axis-Labelling
Here's how you do a lattice-xyplot without border/box, with axes at bottom & left side only, with custom ablines/grid & axis-labelling Read more » Related To leave a comment for the author, please follow the link and comment on their blog: theBioBucket*. R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R a...
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Two-Way PERMANOVA (with Vegan-Function adonis) Using Customized Contrasts
…say you have a multivariate dataset and a two-way factorial design – you do a PERMANOVA and the aov-table (adonis is using ANOVA or “sum”-contrasts) tells you there is an interaction – how to proceed when you want to go deeper into the analysis?You could, however somewhat tedious, customize contrasts for the PERMANOVA and check for dif...
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Test Difference between Two Proportions & Plot Confidence Intervals
..an illustrative example for testing proportions and presenting the results.the data: number of indigenous and alien plant species with and without vegetative reproduction. Hypothesis: The proportion of species with vegetative reproduction is different between alien and indigenuos plant species.Read more » Related To leave a comment for the a...
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Comparing Two Distributions
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 » Related To leave a comment for the author, please follow the link and comment on their blog: theBioBucket*. R-bloggers.com offers ...
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Use of Classification Trees to Investigate Traits of Invasive Species
Which traits make an alien species invasive?Due to what traits an alien species becomes established in a foreign flora?This kind of questions could be analysed by the use of recursive partitioning and classification trees..(the below example also includes some useful data manipulation techniques)…Read more » Related To leave a comment for th...
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Nice Species Distribution Maps with GBIF-Data in R
Here's an example of how to easily produce real nice distribution maps from GBIF-data in R with package maps… Read more » Related To leave a comment for the author, please follow the link and comment on their blog: theBioBucket*. R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many oth...
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Plot Animation with Imported Images
…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 ReadImages.Credit goes out to xingmowang (nzprimarysectortrade-blog) from whom I picked up the concept of p...
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Yet Another One.. Animation with saveHTML / saveVideo from Package ANIMATION
…some more playing with saveHTML, as.raster() and rasterImage(), producing a “flickering screen”:Read more » Related To leave a comment for the author, please follow the link and comment on their blog: theBioBucket*. R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many other topics. Click here...
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