# head

## Wilcoxon Signed-Rank Test

A tutorial of performing statistical analysis with the Wilcoxon signed-rank test.

## Comparison of Two Population Proportions

A tutorial on statistical inference about difference between two population proportions.

## Population Mean Between Two Matched Samples

A tutorial on statistical inference about population mean between two matched samples.

## Quantitative Data

Quantitative data, also known as continuous data, consists of numeric data that support arithmetic operations. This is in contrast with qualitative data, whose values belong to pre-defined classes with no arithmetic operation allowed. We will explain how to apply some of the R tools for quantitative data analysis with examples.

## Data Frame

A tutorial on the concept of data frames in R. Using a build-in data set sample as example, discuss the topics of data frame columns and rows. Explain how to retrieve a data frame cell value with the square bracket operator. Plus a tips on how to take preview of a data frame.

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