Classification Chart. -- A chart in which facts, data, etc., are so arranged that the place of each in relation to all is readily seen.

Column Chart. -- A bar chart in which the bars are arranged vertically. See bar chart.

502 GRAPHIC PRESENTATION

Compound Bar Chart. -- A bar chart with several contrasting bars. See bar chart.

Component Bar Chart. -- A bar chart in which each bar is divided into two or more parts.

Component Curves Chart. -- A curve chart in which the total is shown graphically divided into parts.

Contour Map. -- A map in which lines indicate the topography of the land. The contour method may also be used to show erosion, precipitation, climatic conditions, etc.

Correlation Chart. -- A chart showing degree and type of relationship between two variables,

Cosmograph. -- Trade name for a flow chart made from black and white strips of paper, and presenting numerical information or percentages.

Crosshatched Map. -- See statistical map.

Cumulative Curve. -- A curve in which each value, except the first which is zero, is a total or accumulation of all preceding values.

Curve Chart -- A chart in which a line is plotted on a grid.

Dependent Variable. -- The data presented in a chart or table which varies according to a change in the independent variable. The amount scale on a time curve chart is the dependent variable.

Disc Chart. -- See circle chart.

Distorted Map. -- A map in which the areas of states, countries, etc., are proportional to quantitative data.