Graphing With R

There are a number of ways in ggplot to express your data.  The first are the geometric objects: geom_bar(): Bar charts geom_point(): Points – great for scatter plots geom_line(): Line charts geom_boxplot(): A box & whiskers plot geom_smooth(): Smoothed means with CI geom_histogram(): Histogram geom_density(): Smoothed density plot geom_qq(): A quantile-quantile plot geom_errorbar(): Error bars... » read more

Exploring Data

Before we can perform statistical analysis on our data, we have to check the data.  Do we assume that the data is normally distributed?  Do we assume that each feature (attribute) is independent?  Do we assume that data comes from the same population, under the same conditions? No, we don’t.  We must check (explore) the data... » read more