Hadley Wickham's "dplyr" tutorial at useR 2014 (2/2)

[@ondrejplachy297]

dropbox does not work, i also could not find the airports dataset.

[@senthilramalingam9500]

Malory Knox Its here www.dropbox.com/sh/i8qnluwmuieicxc/AAAgt9tIKoIm7WZKIyK25lh6a and you can find all the datasets.

[@sethchandler7903]

Excited about this video but I am having two initial problems. The nycflights2013 data.frame does not have a plane column. It has a tailnum colum, which appears to be the same thing, but some renaming needs to be done. Also, when I run the code at 1:30 I get an error "Error in n() : This function should not be called directly" I'm not sure what this is about. I am running R 3.1.1 in RStudio 0.98.1028 on OSX .

[@sethchandler7903]

Darn. Ignore second problem. User error. Very sorry I posted before checking more carefully.

[@zakkyang6476]

I think the z score part is not correct. Should be like this: planes_z % filter(!is.na(arr_delay)) %>% group_by(plane) %>% filter(n() >30) %>% mutate(z_delay = (arr_delay - mean (arr_delay))/sd(arr_delay)) %>% filter(z_delay >=3) %>% select(plane, z_delay) %>% arrange(desc(z_delay)) View(planes_z)