I have a spreadsheet organized by years which looks like this DATA SET:
Now, I'm pretty sure that to make this data set 'tidy' i have to turn that Year row into a column. And have as a result the 3 columns, 1 with the model name, 1 with the year, and 1 with the units produced of that model in that year. I tried a few methods I know but couldn't solve it.
Can anyone suggest a method?
EDIT: I already substituted the NA with 0