DEM 7273 Lab I

> # R commands go here.
> # You can adjust fig.height, and fig.width to make graphs look better.
> # For example, for a small graph, try {r fig.width=4, fig.height=4};
> # for a graph with two side-by-side panels, try {r fig.height=4}.

• Intersperse R code chunks with explanatory text as needed.
• Press the Knit button in the toolbar to process the .Rmd file into an .html (or .pdf or .docx) file.
• For more information on using R Markdown in RStudio click on “Help > Markdown Quick Reference”, “Help > Cheatsheets > R Markdown Cheat Sheet”, or “Help > Cheatsheets > R Markdown Reference Guide”.
• Shortcut to Insert R chunk
• Windows users:Ctrl+Alt+I
  
• Mac users: Command+Option+I

Calculate 4⁴4

> 4^4^4

[1] 1.340781e+154

Calculate Exp(4/8)

> exp(4/8)

[1] 1.648721

Assign a value of 10 to an object called X

> x=10

Assign a vector of 1 to 5 to an object called y

> y=c(1, 2, 3, 4, 5)

Calculate the result of log(x*y)

> log(x*y)

[1] 2.302585 2.995732 3.401197 3.688879 3.912023

Store the result of log(x*y) to an object called z

>  z=log(x*y)

Test if the last element of object y is greater than 5

> y[5]>5

[1] FALSE

Identify the structure of x, y, and z

> str(x)

 num 10

Load data covid19 at Bexar county, and view the data

> library(haven)
> bexar_covid <- read_dta('C:/Users/codar/OneDrive/Documents/R/Fall2020 - 7273/bexar-covid.dta')
> View(bexar_covid)

What’s the size of this data frame? How many rows, and how many columns?

> dim(bexar_covid)

[1] 179  67

> length(bexar_covid)

[1] 67