week 2

Question 1

data wrangling parts

Answer 1

1-import
2- tidy
3- transform (visualize, model) all part of understanding, then communicate

Question 2

data code book is

Answer 2

table with all variables in the table

Question 3

importing data 4 parts

Answer 3

1- clear undertsanding of data
2- review codebook
3- learn about data : view head is.na, summary functions
4- quick visual understadn: plot, stem hist

Question 4

what is 2nd part of tidy data

Answer 4

each variable (subject to change) must have its own column
each observation has its own row
each value has its own cell

Question 5

part 3 of transform data using what functions

Answer 5

mutate, filter arrange, summarize, group_by