Bar graph refers to a frequency distribution graph in which a vertical bar indicates the frequency of each score from a nominal or ordinal scale of measurement. It is a means of illustrating the frequency of qualitative data using spaced vertical bars. Qualitative class intervals are plotted on the abscissa, with frequency represented on the ordinate and the frequency of each class represented by the height of the bar over that class interval.
Lexicon of Psychology - Terms, Treatments, Biographies,