Ill=l|l=l|l=l|l=l|l33, Chapter 40
OGIVE AND LORENZ CHARTS
X he Ogive chart
also called a cumulative frequency curve. Its definition is as follows: a frequency distribution in which "more than" or "less than" data are presented. One scale of the grid represents percentages and the other scale represents "more than"
or
"less
is
than" values.
NUMftER OF FAMILIES
NUMftER OF FAMILIES RECEIVIN6 INCOMES OVER SPECIFIED
I
AMOUNTS
90,000,000
20,000,000
10,000,000
<Z Rrdrawn from Advertising and
Number
of
Families Receiving
States 1.
January 1917
Selling,
in
Incomes Over Specified Amounts
amount The number
In reading the above chart the
bottom
in
the
United
1916.
of the
diagram.
of the
income
of families
is
is
read by the scale at the
indicated by the scale at the
left-hand side. 2.
If
learn how many families are receiving an income of $1,500 and upshown by the point where the curve crosses the middle vertical ruling between the $1,000 and the $2,000 lines. This is found to be at 3,750.000 accord-
you wish wards,
it
to is
ing to the scale at the
left.
There
are, therefore,
that are receiving an annual income of $1,500.
approximately 3,750,000 families In the
same way
it
is
possible to
estimate that there arc 5,150,000 families that are receiving an income of $1,200.
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