The value or category in a distribution with the highest frequency.

The middle value in a distribution.

Detecting and resolving errors in coding and data entry.

A cleaning technique that can be programmed for automatic detection in computer-assisted interviewing.

Consists of editing, coding, data entry, and data cleaning.

Shows whether the association in a contingency table is statistically significant.

The most commonly used statistical measure of variation.

The numerical difference between an observed value and the value predicted by the regression line.

Examples are Cramer’s phi and the correlation coefficient.

A graphic display of a univariate distribution.

Documentation for a data file that usually contains the question wording and responses codes for each variable.

Graphic depiction of a bivariate distribution.