Lab 2

library(tidyverse)

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## ✔ readr   1.3.1     ✔ forcats 0.4.0

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## ✖ dplyr::filter() masks stats::filter()
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1. Changing the author field and file name.

(a) Change the author: field on the Rmd document from Your Name Here to your own name.

(b) Rename this file to “lab02_YourHameHere.Rmd”, where YourNameHere is changed to your own name.

2. Data practice

In class we imported the survey data using the read.table() function. (Note: on Homework 1 you’ll be asked to use the read.csv() function instead.)

This is the code we used:

survey <- read.table("http://www.andrew.cmu.edu/user/achoulde/94842/data/survey_data2020.csv", header=TRUE, sep=",") 

(a) How many survey respondents are from MISM or Other?

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(b) What % of survey respondents are from PPM?

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3. Index practice

(a) Use $ notation to pull the OperatingSystem column from the survey data

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(b) Do the same thing with [,] notation, referring to OperatingSystem by name

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(c) Repeat part (b), this time referring to OperatingSystem by column number

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(d) Repeat part (b), this time using the select() function.

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(e) Use filter() and select() together to get the Program and Rexperience of every student who watched at least 10 hours of TV last week.

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4. Optional practice

Try re-running as much of the lecture code as you have time for, taking time to understand what is happening in each line of code.

Tip: Instead of copying and pasting code, practice typing it yourself. This will help you to learn the syntax.

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