R Example

•Descriptive Statistics• Frequency and Histogram Diagrams• Standard Deviation

Excel

• Bar• Histogram• Box / CI’s• Line• Scatter• Pie

Correlation Matrix

BoxplotHistogram

Scatterplot

> getwd()[1] "C:/Users/johnp_000/Documents"

> setwd()

Revisiting the Height Dataset

Dataset Input

Function FilenameObject

str()

Data Types: Numbers and Factors/Categorical

summary()

ece

Frequency Distribution, Histogram

hist(h$childHeight)

Area = 1

Density Plot

plot(density(h$childHeight))

hist(h$childHeight,freq=F, breaks =25, ylim = c(0,0.14))curve(dnorm(x, mean=mean(h$childHeight), sd=sd(h$childHeight)), col="red", add=T)

Bimodal: two modes

Mode, Bimodal

Composite Charts

Boxplot (Box and Whiskers)

50th

75th

25th

Boxplot Options

Basic With Mean Split Data Among Predictors

Correlation

Covariance is High: r ~1

Covariance is Low: r ~0

Galton: Height Dataset

cor(h)Error in cor(h) : 'x' must be numeric

Initial workaround: Create data.frame without the Factors

cor() function does not handle Factors

Later we will RECODE the variable into a 0, 1

Excel correl() does not either

Data Types: Numbers and Factors/Categorical

Correlation Matrix for Continuous Variables

chart.Correlation(num2)PerformanceAnalytics package

Correlations Matrix: Both Types

library(car)scatterplotMatrix(heights)