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R Language

R Language. What is R? Variables in R Summary of data Box plot Histogram Using Help in R. What is R ?. R is a free, cross-platform, open-source statistical analysis language and program.  Many statistical functions are already built in. Variables. Numeric > a = 49 > sqrt(a)

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R Language

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  1. R Language

  2. What is R? • Variables in R • Summary of data • Box plot • Histogram • Using Help in R

  3. What is R ? • R is a free, cross-platform, open-source statistical analysis language and program.  • Many statistical functions are already built in

  4. Variables • Numeric > a = 49 > sqrt(a) [1] 7 • String > a = "The dog ate my homework" > sub("dog","cat",a) [1] "The cat ate my homework“ • Logical > a = (1+1==3) > a [1] FALSE

  5. vector: an ordered collection of data of the same type > a = c(1,2,3) To examine the contents of the variable a >a [1] 1 2 3 > a*2 [1] 2 4 6 > a[2] [1] 2

  6. list: an ordered collection of data of arbitrary types. > d = list(name="john",age=28,married=F) > d$name [1] "john“ > d$age [1] 28

  7. Mean • Dataset: > x=c(0,4,15, 1, 6, 3, 20, 5, 8, 1, 3) >y= 1:6 >y [1] 1 2 3 4 5 6 • The Mean > mean(x) [1] 6 OR > sum(x)/length(x) [1] 6

  8. Median • Sort the dataset if it is not sorted >sort(x) [1] 0 1 1 3 3 4 5 6 8 15 20 • The Median > median(x) [1] 4 > median(y) [1] 3.5

  9. Quantiles • Q1 > quantile(x,0.25) 25% 2 • Q3 > quantile(x,0.75) 75% 7 • Quantiles > quantile(x,c(0,0.25,0.5,0.75,1)) 0% 25% 50% 75% 100% 0 2 4 7 20

  10. Five Number Summary > summary(x) Min. 1st Qu. Median Mean 3rd Qu. Max. 0 2 4 6 7 20

  11. The Spread of the Data Set • Range > range(x) [1] 0 20 • IQR > IQR(x) [1] 5

  12. Boxplot • Standard Boxplot > boxplot(x,range=0) • Modified Boxplot > boxplot(x)

  13. Histogram > hist(x) • Adding a title > hist(x,main=“Weight Gain”) • Adding Axis labels >hist(x , main=“Weight Gain”,xlab=“Weight Gain”, ylab =“Frequency”) • Change the color >hist(x , main=“Weight Gain”,xlab=“Weight Gain”, ylab =“Frequency”, col=“blue”)

  14. Read CSV > mydata=read.csv("dataset.csv") > mydata Age Income 1 10 0 2 25 35000 3 43 75000 4 32 55000 5 70 25000 6 19 20000 7 5 0 8 21 20000 9 35 60000 10 24 30000

  15. How to use help in R? • R has a very good help system built in. • If you know which function you want help with simply use ?_______ with the function in the blank. • Ex: ?hist. • If you don’t know which function to use, then use help.search(“_______”). • Ex: help.search(“histogram”).

  16. Activity • Using R language, Answer question 4 from the Tutorial. • Export the resulted graphs.

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