Sorry, this is the first time I posted the question.
As you can see Renevuepervisit is the column I computed.
Whenever I tried to plot it, it would show the error
# A tibble: 91 × 8
Week Campaign Visits Revenue Cost Renevuepervisit Costpervisit
<dbl> <chr> <dbl> <dbl> <dbl> <dbl> <dbl>
1 1 Aldebaran 27 2.27 3.76 0.08 0.14
2 2 Aldebaran 64 10.8 15.3 0.17 0.24
3 3 Aldebaran 80 7.13 10.8 0.09 0.13
4 4 Aldebaran 93 11.1 16.9 0.12 0.18
5 5 Aldebaran 120 14.3 21.4 0.12 0.18
The code I run was
ggplot(data = marketing_campaigns, aes(x = Week))+
+ geom_line(aes(y = Revenuepervisit, colour="#606060"))+
+ geom_line(aes(y = Costpervisit, colour="#303030"))+
+ facet_grid(Campaign ~ .)
Thank you