Theory, Examples & Exercises
Example data from first four years of the experiment, included in the book of Lepš & Šmilauer (2003) and Šmilauer & Lepš (2014), originally published in Lepš (1999).
Long term experiment data, which monitors the influence of three different treatments on species composition of wet meadow vegetation. The treatments are as following: removal of dominant species (Molinia caerulea), fertilizing and mowing. The experiment has a form of latin square, divided into 24 plots (each treatment and their combinations are each represented by three replicates). Provided dataset represents 4 years of observations (1994-1997).
Experiment is conducted in experimental wet meadow Ohrazení, located around 10 km SE of České Budějovice, Czech Republic. The vegetation can be classified into alliances Molinion and Violion caninae.
|Name of variable||Description|
|MOWING||Mowing (each year in June or July)|
|FERTIL||Fertilized (65g NPK/m2)|
|REMOV||Dominant removal (Molinia caerulea) using screw-driver (conducted the first year and repeated every year if necessary)|
|YEAR||Year of observation (0 = 1994, i.e. before the experiment started, 1-3 = 1995-1997)|
|Yr0-Yr3||Year of observation (dummy variable)|
|P1-P24||Plot code (can be used as covariable)|
|File name||File type||Description|
|ohraz.xls||Excel file||Contains species × sample matrix, environmental variables, description of experimental design and other information (this file comes with the book of Lepš & Šmilauer (2003), Chapter 15)|
|ohrazeni-spe.txt||tab-delimited txt format||Sample × species matrix (96 samples in rows, 86 species in columns)|
|ohrazeni-env.txt||tab-delimited txt format||Environmental variable matrix (samples in rows, variables in columns)|
ohrazeni.spe <- read.delim ('https://raw.githubusercontent.com/zdealveindy/anadat-r/master/data/ohrazeni-spe.txt', row.names = 1) ohrazeni.env <- read.delim ('https://raw.githubusercontent.com/zdealveindy/anadat-r/master/data/ohrazeni-env.txt', row.names = 1)