When the code examples are written, two types of quotation marks are being used. One does not translate into string when copied into the R console. This should be fixed to only use the "correct" quotation marks, so that people can copy and paste this code directly into their console if desired.
When the code examples are written, two types of quotation marks are being used. One does not translate into string when copied into the R console. This should be fixed to only use the "correct" quotation marks, so that people can copy and paste this code directly into their console if desired.