Character variables are interpreted as numeric variables

[jan-imbi]

Should probably be coerced into factors.

[jan-imbi]

Maybe not though, since sometimes users import data from excel sheets and get numerical variables as characters (e.g. age = "10.1", "8.0", ...).

We could also try to coerce character variables into numeric variables and throw a warning if this happens (e.g. "Character variable coerced to numeric. Did you mean to input a factor instead of a character variable?").

Decision needs to be made