How to get proportions in R using table function? [closed]

Answer 1

Indexing is the key. You can table two variables according to the criteria that you need. Consider these data:

dt  <- data.frame(gender = rep(c("Male", "Female"), c(4, 2) ), trans = rep(c("Car", "Bus", "Bike"), c(3, 2, 1) ))

table(dt)
        trans
gender   Bike Bus Car
Female    1   1   0
Male      0   1   3

By adjusting the arguments of dt$colname, you can get a finer control over the final output. I think this is the point that requires attention. Here I want only the people using the car.

 table(dt$gender[dt$trans=="Car"])

Female   Male 
     0      3  

For your case, hence, try to handle the problem with indexing. Instead of

prop.test(table(CRDATA$Year,CRDATA$Arrest)), 

try

prop.test(table(CRDATA$Year[CRDATA$Arrest == "FALSE"]))