R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see http://rmarkdown.rstudio.com.

When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

summary(cars)
##      speed           dist       
##  Min.   : 4.0   Min.   :  2.00  
##  1st Qu.:12.0   1st Qu.: 26.00  
##  Median :15.0   Median : 36.00  
##  Mean   :15.4   Mean   : 42.98  
##  3rd Qu.:19.0   3rd Qu.: 56.00  
##  Max.   :25.0   Max.   :120.00

Including Plots

You can also embed plots, for example:

Note that the echo = FALSE parameter was added to the code chunk to prevent printing of the R code that generated the plot.

New Plot

ggplot(mtcars, 
       aes(x = hp, y = mpg, group = cyl, color = factor(cyl))) +
  geom_point()+
  labs(x = "Horsepower", y = "Miles per Gallon(MPG)", color = "Cylinders")

From this graph we can see that the general relationship between horsepower and Miles Per Gallon is that as horsepower increases, Miles Per Gallon decreases. The quantity of cylinders seems to correlate with the horsepower of a car, and inversely correlates with the miles per gallon.

Concluding Thoughts

The most difficult part of this assignment for me was remembering how to use ggplot again, I had to go back to previous assignments from Stat 184 to remind myself of the syntax for ggplot, especially when choosing a plot type using geom_ and the aes input.