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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

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Exercise instructions

  • Save summary stats for whole weight, shucked weight and shell weight in abaloneKeep as absummary.
  • Display columns 1 to 2 out of absummary.
  • Get descriptive statistics of abalone whole weight, shucked weight, and shell weight in abaloneKeep using psych::describe() and save output as abpsych.
  • Display the mean absolute deviation mad from abpsych.

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
___
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