No exercises
Thanks ever so much for this amazing set of solutions. I learned as much from this as from the R4DS textbook. I just made a donation to the kākāpō recovery (as suggested by the r4ds online version) and would be happy to make a similar donation to any charity of your choice. Just let me know what cause you'd like me to support. Thanks again for your awesome work!
"Terms of US Presdients", subtitle = "Roosevelth
Nothing important, but a couple of typos here: "Presdients" and "Roosevelth". The latter should be Eisenhower (as in the y-axis).
I use arrange() and slice() to select the largest twenty diamonds
I guess an alternative would be to drop "arrange()" and use the slice_max() function instead? That is, slice_max(carat, n = 20, with_ties = FALSE).
The lyrics for Ten in the Bed are
We're asked to convert the lyrics to a function that can be generalised to any number of people in the bed. Isn't the following closer to answering the question fully:
library(english)
ten_bed <- function(x) { lyric_1 <- c("There were ") lyric_2 <- c(" in the bed And the little one said, “Roll over! Roll over!” So they all rolled over and one fell out\n") number <- as.character(as.english(x:1))
for (i in number) { if (i != "one") { cat(lyric_1) cat(i) cat(lyric_2) cat("\n") } else { cat("There was one in the bed And the little one said, “Alone at last!” “Good Night!”") } } }
ten_bed(x)
sum(sq_err)
Doesn't one also need to add "na.rm = TRUE" here?
Words that contain only consonants
An alternative: str_view(words, "[aeiou]", match = FALSE)
Or, using str_subset: str_subset(words, "[aeiou]", negate = TRUE)
foreign
If one adds "%>% distinct(dest)" to the expression, one sees that there are four airports that are not in the FAA list: BQN, SJU, STT, and PSE. Three of these are in Puerto Rico, one (STT) is in US Virgin Islands.
precipitation
Perhaps the association with visibility is even stronger.
on
only
They may be combining different flights?
It seems to refer to diverted flights. The original BTS data also has diverted airport information, including a variable DivArrDelay with the following description: "Difference in minutes between scheduled and actual arrival time for a diverted flight reaching scheduled destination. The ArrDelay column remains NULL for all diverted flights." I browsed this data quickly and, indeed, those missing arr_delay observations have values in the DivArrDelay variable.