Changing categorical data to numeric according to other categorical data

[aqualion9]

Hello, I have data on species in different state parks. There are four main columns: Region (categorical), Park (categorical), Nativeness (categorical), Organism (Categorical). The ultimate goal is to run a two way ANOVA on the dataset, but to do that I need to make the Nativeness category numeric according to park. In the end I want a number of native species for each park. I tried using

data$category <- as.numeric(data$category) 

but that just turned all of the "natives" in the nativeness column into the same number rather than adding them up according to national park before turning the data into numeric.
Thanks for your help!

[mwachira]

When you say turn the categorical into numerical, do you mean you want counts for each category? Or do you mean you want to use a number to represent the category?

[nirgrahamuk]

Hi!

To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.2…

[aqualion9]

I meant the counts for each category - thanks! So for example there would be a total of say 830 native species in one park.

[aqualion9]

Sure, here's an example of the data set (hopefully the formatting works)

    Region    Park   Nativeness   Organism
1 Mid Eastern  XXX    Native   AAA
2 Mid Eastern  ZZZ    Native   BBB
3 Mid Eastern  XXX    Native   CCC
4 Mid Eastern  RRR    Native   AAA
5 Mid Eastern  XXX    Native   CCC

So with this set, I want the program to sort the data so that I have this information (not in this format):

Park XXX has 3 native species, organisms AAA, CCC, CCC
Park ZZZ has one native, organism BBB
Park RRR has one native species, organism AAA
All Parks still have data on which organisms

Thanks!

[nirgrahamuk]

You had a good instinct to share something about the data of concern.

However, the way you did it does not facilitate easy copy and pasting of your data, so a user can easily add it to their R session.

You can read this guide to see how such things are possible via datapasta package, or base::dput()
FAQ: How to do a minimal reproducible example ( reprex ) for beginners