Descriptive statistics output
Up to now, you've only printed your output to the console. In this exercise, you will save your output from both the summary()
and psych::describe()
functions for descriptive statistics of the abalone weight measurements.
First, you will save output from the summary()
function, which is a table
class object. Elements from table objects can be selected using the [row, col]
syntax.
Next you will save the output from the psych::describe()
function. This output is a customized class type called psych
describe
, which is also a data.frame
class. So, elements of psych::describe()
output can be extracted using the $
operator to select elements by name from this output.
The abaloneKeep
dataset, dplyr
and psych
packages have been loaded for you.
This exercise is part of the course
R For SAS Users
Exercise instructions
- Save summary stats for whole weight, shucked weight and shell weight in
abaloneKeep
asabsummary
. - Display columns 1 to 2 out of
absummary
. - Get descriptive statistics of abalone whole weight, shucked weight, and shell weight in
abaloneKeep
usingpsych::describe()
and save output asabpsych
. - Display the mean absolute deviation
mad
fromabpsych
.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Save summary stats output for 3 requested weights
absummary <- ___ %>%
select(___) %>%
___
# Pull columns 1 to 2 out of absummary
absummary[,___]
# Save describe from psych output for weights as abpsych
abpsych <- ___ %>%
___ %>%
___
# Display the mad element from abpsych
___