How do I get ggplot to order facets correctly?

Question

I am trying to facet about 14 plots based on a variable that runs from 2-14. The plots show up in the order: 10,11,12,13,14,15,2,3,4,5,6,7,8,9

How do I get them to

Answer 1

data$var <- factor(data$var, levels = sort(unique(data$var)))