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Wednesday, September 25, 2013

NFL week 3 update

With another NFL week down we are starting to see separation from the contenders and the “better luck next year” teams.  Any paid TV mouthpiece worth their salt will tell you it is a quarterback driven league.  Driven indeed.  In the last post, I dabbled in the simple code of a correlation heat map.  Now, I realize I may have led the flock astray in my haste to create some wow graphics using the data from advancednflstats.com.  But that is the great thing about R, the ability to cook up some code and add salt to taste.  So, let’s kick it up a notch with a look at the week 3 NFL QB data, creating different versions of correlation plots.  Choose your preference, a la carte!

> library(corrplot) #load the versatile package corrplot
> attach(nfl)
> head(nfl)
Note: top 5 quarterbacks thru week 3:
      1.      Peyton Manning
      2.      Jay Cutler
      3.      Ryan Tannehill
      4.      Drew Brees
      5.      Philip Rivers

> qb = cor(nfl[ ,4:15]) # correlation subset of continuous variables

The package corrplot has 7 different visualization methods: "circle", "square", "ellipse", "number", "shade", "color", "pie"


> corrplot(qb, method = "circle")






















> corrplot(qb, method = "ellipse")


























Two nice examples, but this is my favorite below.  I really like the ability to see both the visual portrayal and the statistics on one chart.

> corrplot.mixed(qb)




















If you are interested in further pursuing corrplot, I recommend this website.


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