I have a data set at hand that I want to generate subsets from. For my first subset I only need 2 columns from the previous total data set, which both consist of categorical variables, each with several characteristic values. However, the data subset I want to generate is supposed to capture only one characteristic of each column/variable.
I used the following command:
data_bamako_OV1 <- subset(data, admin1==Bamako, year==2022, select = c(year, admin1))
Then, the following error message popped up:
Error in subset.default(data, admin1 == Bamako, year == 2022, select = c(year, : object 'admin1' not found
So my question is, has this error occurred, because my filter assignments are categorical instead of numeric? And if so, how can I transform these nominal categorical characteristics into nominal numeric characteristics (10 characteristics in total for admin1; 6 characteristics in total for year)?