MASS

A tutorial on computing the point estimate of population mean from a simple random sample.

It is a common requirement to efficiently estimate population parameters based on simple random sample data. In the R tutorials of this section, we demonstrate how to compute the estimates. The steps are to be illustrated with a built-in data frame named survey. It is the outcome of a Statistics student survey in an Australian university.

A tutorial on computing numerical measures of qualitative data in a data sample.

A tutorial on computing the pie chart of qualitative data in statistics.

A tutorial on computing the bar graph of qualitative data in statistics.

A tutorial on computing the relative frequency distribution of qualitative data in statistics.

A tutorial on computing the frequency distribution of qualitative data in statistics.

A data sample is called qualitative, also known as categorical, if its values belong to a collection of known defined non-overlapping classes. Common examples include student letter grade (A, B, C, D or F), commercial bond rating (AAA, AAB, ...) and consumer clothing shoe sizes (1, 2, 3, ...).