Download a copy of the
Portal Teaching Database surveys table
and load it into R using read.csv().
select() to create a new data frame with just the year, month,
day, and species_id columns in that order.mutate(), select(), and na.omit() to create a new data frame with
the year, species_id, and weight in kilograms of each individual,
with no null weights.filter() function to get all of the rows in the data frame for the
species ID SH.group_by() and summarize() functions to get a count of the number
of individuals in each species ID.group_by() and summarize() functions to get a count of the number
of individuals in each species ID in each year.filter(), group_by(), and summarize() functions to get the mean
mass of species DO in each year.