Empirical Category Curves - Frequency Polygons |
These are the empirical (data-describing) category curves (frequency polygons). They are obtained by clicking on "Empirical Cat. Curves" or from the Graphs menu. The width of each empirical interval can be adjusted by the "Empirical Interval" control. The smoothing of the empirical curves by discrete cubic splines is adjusted by the smoothing control.
Buttons are described in Graph window.
Charles S. Duris (1980). Fortran Routines for Discrete Cubic Spline Interpolation and Smoothing. ACM Algorithm 547.
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