A moving average, often used in graphic charts, is obtained in this way: the statistics for a number of years are averaged and the result is plotted at the half-way mark. Thus if the data for the 9 years from 1890 to 1898 had been averaged, the result would be plotted at the year 1895.

COMPARISONS WITH CURVES

'• E

(J o

o

L.

a.

>«

'<o

0)

0) <0

Id wt-

_ O

u a,

Li ^

0)

>

<

> o

^ o

i 2

o -D --

c So

E «> O

t: _2 <N

£ ^£:

c -o

- ij

V c

c c

2 5

M JJ

"■ a

It o

> 1.

a£

T3 a

CD „

> «

15 i

GRAPHIC PRESENTATION

Active File

...... Inflow of Appliconts

^^-- Outflow of Applicants

Excess outflow of appliconts over inflow.

Excess inflow of applicants over outflow.

U S Employment Srrvirc "Survey of Employmrnt Service Information." Fetiriinry I9J8.

Effect of Outflow and Inflow of Applicants in the U. S. Employnnent Service on the Active File from April 1934 to January 1938.

1. Whereas each of these three curves minht have been presented separately, the combination of the tliree presents a picture not otherwise possible.

2. Notice how a solid section in the two lines at the bottom is rcHected in the upper one.

3IE

COMPARISONS WITH CURVES

FftCSHMEN

1912 1913 19W 1915 1916 1917

6,000

5,000

SOPHOMORES

JUMIORS SENIORS

4/XX)

3,000

2.000

Engineering Nfw«-Rccord, Novfmber 29, 1917.