|a| Point data should be plotted on such point-of-time rulings, lb) Period data should be plotted midway between point-of-time rulings.

2. IN ACTUAL PRACTICE, however, this principle may often be disregarded in showing period data.

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1 -«•«« 0«T»- {I |fO« MONTMJ KOTCOJI

JAN FEB MAR APR MAY JUN

Point doto on verticals. Period doto midway between

Theory followed in showlr>g period doto on verticals

GRAPHIC PRESENTATION

LOCATION OF TIME-SCALE DESIGNATIONS Principle

1. Time-scale designations should be placed where they con be read most easily in conjunction with the curves.

Procedures

1. USUALLY AT BOnOM OF GRID BECAUSE:

lol The bottom o( the chart is the conventional location.

(b) The base line is ordinarily the principal line oi relerence to which

the eye travels lor a basis of comparison. |cl In many coses, the curve starts near the bottom of the grid, eg.,

growth curves starting near the base line. (dl The scale designations at the bottom odd to the appearance of

the chart in balancing the weight ol the composition.

2. SOMETIMES AT TOP AND BOHOM-- (al When the grid is unusually high.

(bl When the vertical rulings are so numerous as to cause difficulty

in following them to the scole at the bottpm. Icl When a considerable portion of the curve lies near the top of the

grid.

3. AT TOP ONLY, IN SPECIAL CASES--

la) When it is desired to emphasize the time periods in conjunction