The ratio of 1 (short side) to 1.414 (long side) is particularly appropriate for correspondence size sheets (nominally 81/2" X 11").

Note: A rectanflle of this proportion is Icnown as a "root-two" or "hypotenuse" rectangle, the long side of which is equal to the diagonal of a square constructed on the short side. This rectangle possesses the unique characteristic that when divided in half width-wise, each resulting rectangle is also of root-two proportions; a characteristic useful in grouping charts on a page.

STANDARDS FOR TIME SERIES CHARTS

IMPORTANCE OF PROPER SCALE SELECTION

EFrECT OF SCALE ALTERATION - CHART SHOWING MOVEMENT

OAiCINAL SCALC ARnANCCUCNT

*

/

--n/

n

*rf

ONTIUCTIMC TIMC tCALt

.1

/\

0 _.

COMTHACTIMC

AMOUNT SCALC

*

/

^

n

w

OMMDIMC TIUI

SCALI

,/

^^

^"^

y

♦

^j,^

n

f^

EFFECT OF SCALE ALTERATION - CHART SHOWING TREND

0«ICINAL SCALE AARANCCMCNT

COMTIIACTINC

,

uc

JCALt

IXPANOINc/luOUMT JCALC

.««,

THACTIN OIHC Ak

<0

JH1

■*•€

L»

I'

/

/

f

/

r

/

r

/

'

_

CSNTItACTINC AMOUNT SCALC

CIMNOINC TlUC SCALC

p

\

^

.^^

_^

^,1--

^

^^

_-- --■

"^

0^

--^ 1

GRAPHIC PRESENTATION

RELATION OF TIME SCALE TO AMOUNT SCALE

1. The relofion between the time scale and the amount scale has a determining influence on the movement of time-series curves.

Note: The movement of o curve ij here understood to meon the o'opf^ic effect of the progressive chonges in the quantity considered The trend is the graphic effect of the overoil changes in the quontity considered