R Example Descriptive Statistics Frequency and Histogram Diagrams Standard Deviation

Excel Bar Histogram Box / CI’s Line Scatter Pie

Correlation Matrix BoxplotHistogram Scatterplot

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Revisiting the Height Dataset

Dataset Input Function Filename Object

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 BasicWith 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)