Learning dplyr with a few practical examples

 in Data Transformation with dplyr / Starting with dplyr

In this section “Transforming data with dplyr”, we will study the most interesting/useful functions in dplyr using concrete examples in biology. These examples are:

  • – a pair of data frames called BCI and BCI.env (BCI: Barro Colorado Island Tree Counts) found in the package vegan. The documentation about vegan may be found here,
  • – a simpler data frame called Orange which documentation may be found here.

 

About the data frames in vegan

Description
Tree counts in 1-hectare plots in the Barro Colorado Island and associated site information.
 
Usage
data(BCI)
data(BCI.env)
 
Format
A data frame with 50 plots (rows) of 1 hectare with counts of trees on each plot with total of 225 species (columns). Full Latin names are used for tree species. The names were updated against http://www.theplantlist.org and Kress et al. (2009) which allows matching 207 of species against doi: 10.5061/dryad.63q27 (Zanne et al., 2014) […] For BCI.env, a data frame with 50 plots (rows) and nine site variables derived from Pyke et al. (2001) and Harms et al. (2001) […].

 
Reference: Package ‘vegan’, https://cran.r-project.org/web/packages/vegan/vegan.pdf
 

Quick overview of BCI

data(BCI)
View(BCI)

 

Quick overview of BCI.env

data(BCI.env)
View(BCI.env)


 

About the data frame Orange

Description
The Orange data frame has 35 rows and 3 columns of records of the growth of orange trees.
 
Format
An object of class c(“nfnGroupedData”, “nfGroupedData”, “groupedData”, “data.frame”) containing the following columns:

  • Tree: an ordered factor indicating the tree on which the measurement is made. The ordering is according to increasing maximum diameter.
  • age: a numeric vector giving the age of the tree (days since 1968/12/31).
  • circumference: a numeric vector of trunk circumferences (mm). This is probably “circumference at breast height”, a standard measurement in forestry.

 
Reference: ‘Growth of Orange Trees’, https://stat.ethz.ch/R-manual/R-patched/library/datasets/html/Orange.html

Quick overview of Orange

data(Orange)
View(Orange)

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