TM5-6675-326-14
8-6.12.6 Linear Estimation - Continued
Keystrokes
D i s p l ay
Predicted demand in millions
of barrels for the year 2000.
The demand is expected to
pass 3,500 million barrels
during 1992.
8 - 6 . 1 2 . 7 C o r r e l a t i o n C o e f f i c i e n t .
Both linear regression and linear
estimation presume that the relationship between x and y data values can
be approximated, to some degree,
b y a l i n e a r f u n c t i o n ( a s t r a i g h t l i n e ).
r (correlation coefficient) can be used to determine how closely the data
“ f i t s * ’ a s t r a i g h t l i n e .
The correlation coefficient can range from r = 1
t o r = - 1 . A t r =
1 , d a t a f a l l s e x a c t l y o n t o a s t r a i g h t l i n e w i t h p o s i t i ve
slope.
W h i l e a t r = - 1 , d a t a f a l l s e x a c t l y o n t o a s t r a i g h t l i n e w i t h
negative slope .
A t r =
0, data cannot be approximated by a straight line.
Example:
T o c a l c u l a t e t h e c o r r e l a t i o n c o e f f i c i e n t f o r p r e v i o us
example (para 8-6.12.6) press
Keystrokes
Display
0.9931
The data very closely
approximates a straight line.
Section III. OPERATOR MAINTENANCE
8-7 LUBRICATION INSTRUCTIONS.
This equipment does not need lubrication.
8-8 OPERATOR TROUBLESHOOTING PROCEDURES.
8 - 8 . 1 G e n e r al
8-8.1.1 The table lists the common malfunctions which you may find during
the operation or maintenance of the pocket calculator.
You should perform
t h e t e s t s / i n s p e c t i o n s a n d c o r r e c t i v e a c t i o n s i n t h e o r d e r l i s t e d .
8-8.1.2 This manual cannot list all malfunctions that may occur, nor all
tests or inspections and corrective actions .
I f a m a l f u n c t i o n i s n ot
l i s t e d o r i s n o t c o r r e c t e d b y l i s t e d c o r r e c t i v e a c t i o n s , n o t i f y y o ur
s u p e r v i s o r .
8-26
