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.

y = Vector of outcomes

cbind makes this a column vector

y<- cbind(c(118000, 84000)) y

X = Matrix of scores

rbind makes this a column vector

X<- rbind(c(1,10,4,50), c(1,16,3,35)) X

b <- cbind(c(30572,1395,5911,382)) b

y.pred <- X %% b # To multiply matrices in R, use %% instead of just y.pred <- X %% b

y.pred

e <- y - y.pred e

Compare to presentation’s answers:

30734

5