Counting the occurrences of Favia
Exercise Type: Implementation
Favia favus
Instructions
Calculate the number of occurrences and collections of the genus Favia in this old excerpt from the Paleobiology Database.
-
Download the occurrence file: favia.csv
-
Read it into R with
read.csv()
! -
Calculate how many occurrences (rows in the table) the genus has where the
stg
(stage) column’s value is 87! This indicates Priabonian (Eocene) stage. This should be a single numeric value. -
Calculate how many different collections (entries in the
collection_no
column) there are in this stage! This should be a single numeric value. -
Calculate which
stg
numbers does this genus occur in! This should be a numeric vector. -
Calculate the number of occurrences and collections in every stage! These should be two numeric vectors.
Hint: initially, use a for
loop to do this - although we will solve this in more functional way too!