# Introduction to Data Analysis with R

September 19, 2018
By

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## Using Basic Data Analysis functions on the mtcars dataset

### Let’s Start

`# Copying mtcars data frame to our new data frame myCarsmyCars <- mtcars`

#### Which car has the highest horsepower (hp) ?

`#find and display the car with the highest horsepower index <- which.max(myCars\$hp)# Display the car name along with the rest of the row myCars[index,]`
`##                mpg cyl disp hp drat  wt  qsec vs am  gear carb ## Maserati Bora  15   8  301 335 3.54 3.57 14.6  0  1    5    8`

Maserati Bora has the highest horsepower at 335

#### Exploring miles per gallon (mpg) of the cars

`# find and display the car with the highest mpgindex<-which.max(myCars\$mpg)myCars[index,]`
`##                 mpg cyl disp hp drat    wt qsec vs am gear carb ## Toyota Corolla 33.9   4 71.1 65 4.22 1.835 19.9  1  1    4    1`
`# Creating a sorted dataframe, based on mpghighMPGcars <- myCars[ order(-myCars\$mpg),]head(highMPGcars)`
`mpg cyl  disp  hp drat    wt  qsec vs am gear carb ## Toyota Corolla 33.9   4  71.1  65 4.22 1.835 19.90  1  1    4    1## Fiat 128       32.4   4  78.7  66 4.08 2.200 19.47  1  1    4    1 ## Honda Civic    30.4   4  75.7  52 4.93 1.615 18.52  1  1    4    2## Lotus Europa   30.4   4  95.1 113 3.77 1.513 16.90  1  1    5    2 ## Fiat X1-9      27.3   4  79.0  66 4.08 1.935 18.90  1  1    4    1 ## Porsche 914-2  26.0   4 120.3  91 4.43 2.140 16.70  0  1    5    2`

#### Which car has the “best” combination of mpg and hp?

`# Best car combination of mpg and hp, where mpg and hp must be given equal # weightbestCombo<- myCars\$hp / myCars\$mpgmyCars[which.max(bestCombo),]`
`##                mpg cyl disp  hp drat   wt qsec vs am gear carb ## Maserati Bora  15   8  301 335 3.54 3.57 14.6  0  1    5    8`

The Maserati Bora hp to mpg is ~ 22hp per gallon

The post Introduction to Data Analysis with R appeared first on FinderDing.

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