2.5.1

Use R to display the file path to the work directory?

From getwd(), I got R to display the file path to the work directory as: “/Users/tiffamee/Desktop/FALL 2017/CLASSES/PH 251D/Homework Chapter 2/ph251d-homework”.

2.5.2

Recreate Table 2.26 using any combination of the matrix, cbind, rbind, dimnames, or names functions.

table2.26 <- matrix(c(139, 443, 230, 502), 2,2) #creating the matrix rownames(table2.26) <- c(“Dead”, “Alive”) #naming the rows colnames(table2.26) <- c(“Yes”, “No”) #naming the columns names(dimnames(table2.26)) <- c(“Vital Status”, “Smoking”) table2.26

library(knitr)
table2.26 <- matrix(c(139, 443, 230, 502), 2,2)

rownames(table2.26) <- c("Dead", "Alive")

colnames(table2.26) <- c("Yes", "No")

names(dimnames(table2.26)) <- c("Vital Status", "Smoking")


kable(table2.26, caption = "Recreating Table 2.26")
Recreating Table 2.26
Yes No
Dead 139 230
Alive 443 502