So let us suppose we only want to look at a subset of the data, perhaps only the chicks that were fed diet #4? To do this, we’re going to use the subset command. We are also going to save a copy of the results into a new dataframe (which we will call testdiet) for easier ...
Selecting a specific column To select a specific column, you can also type in the name of the dataframe, followed by a $, and then the name of the column you are looking to select. In this example, we will be selecting the payment column of the dataframe. When running this script, R...
%in%: group membership. For example, “value%in%c(2, 3)” means that value can takes 2 or 3. is.na(): is NA !is.na(): is not NA. Logical operators value == 2|3: means that the value equal 2 or (|) 3. value%in%c(2, 3) is a shortcut equivalent to value == 2|3. &...
I don't disagree here. There is a difference when selecting only one column (specifically returning a Series vs a DataFrame) but when selecting multiple columns it would be more consistent if we ALWAYS required double brackets brackets. I assume this would also yield a simpler implementation. Ma...