Problem Set # 0

Rebekah Jones

date()
## [1] "Tue Sep 20 21:03:30 2016"

Due Date: September 13, 2016

Total Points: 16

1 Assign to an object x the sum of 3 and 5. Find the square root of the sum (4).

x <- 3+5
sqrt(x)
## [1] 2.828427

2 Creat a vector (h) with the following elements and table the count frequencies: 2 4 0 3 1 0 0 1 2 0 (4).

h<-c(2,4,0,3,1,0,0,1,2,0)

3 Create a histogram from a set of random numbers.

  1. Create a vector y whose elements are 1000 random numbers from the standard normal distribution (2).
y<-rnorm(1000)
  1. Make the vector a data frame (call it df) (2).
df<- data.frame(y)
  1. Use the ggplot() and geom_histogram() functions to create a histogram with a binwidth of .2 (4).
library("ggplot2")
y = rnorm(100)
df = data.frame(y)
head(df)
##            y
## 1 -0.1955156
## 2  2.5874733
## 3 -1.0272424
## 4  0.2585525
## 5  1.6688076
## 6  1.1838957
library(ggplot2)
ggplot(df, aes(y)) +
  geom_histogram(binwidth = .2)

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