scattergram

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scattergram

[′skad·ər‚gram]
(petrology)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

scatter diagram

or

scattergram

a diagram produced on a graph to illustrate the relationship between two variables by indicating the values of these for each case in the sample. It may be a first stage in data analysis, allowing ‘eye-balling’ of the data to observe any association or CORRELATION between the variables.
Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000
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This idea is of course related to how close the points on a scattergraph lie to the straight line drawn at 45[degrees] from the origin.
The theory as popularly enunciated would imply a strong and positive relationship between the two variables shown in Figure 1, a relationship that, had it been valid, would have resulted in a trend in the scattergraph directed from the lower left corner to the upper right.
Figure 2 is a scattergraph showing the 1986 P/E ratios plotted against management's stock ownership percentages for the same year.