MANE 6313

Week 2, Module E - Univariate Data Creation and Analysis

Module E will focus on univariate data creation and analysis. An excellent resource for the data analysis portion of this module is the Stats and R Blog.

Data Creation

R stores a single variable in a vector
There are two primary ways to create univariate data in R:
c() function
functions that create data such as rnorm
Use example datasets in R (not covered)

c() Function

Most common way to create univariate data

c() Function Example

rnorm Function

Built-in function to generate n random normal observations with mean value of mean and standard deviation of sd
Mean and sd are optional arguements and default to values of 0 and 1 respectively
rnorm(n,mean,sd)

rnorm Function Example

Descriptive Statistics

Descriptive statistics refer to the values of numerical functions applied to data. Examples of descriptive statistics include mean, median, mode, standard deviation, variance, range, IQR, etc.
Descriptive statistics in R include:
summary()
describe()