CORRELATION AND REGRESSION PROGRAM
By Daniel Wedge
For Casio fx-9700 calculators

*** MORE GAMES AND PROGRAMS FOR CASIO CALCULATORS AT ***
******** http://www.student.uwa.edu.au/~wedgey *********

This program will determine the correlation coefficient, the
covariance and the line of best fit, given:
        sum of x
        sum of x^2
        sum of y
        sum of y^2
        sum of xy
        number of stats

You will need to put your calculator into regression mode
before entering this program (shift+menu, F4)

SYMBOLS USED
$x  sum of x
$x2 sum of x^2
$y  sum of y
$y2 sum of y^2
$xy sum of xy
^2  squared (the button)
@   display
=>  and/then
->  assign key
!=  not equal to
<=  less than or equal to
>=  greater than or equal to
*   multiply
/   divide
   
size: 263 bytes

'CORR+REG
0->A~Z
"$x"? -> A
"$x2"? -> B
"$y"? -> C
"$y2"? -> D
"$xy"? -> E
Lbl 0
"n"? -> F
F!=Int F => Goto 0
F<=0 => Goto 0
A/F -> X
C/F -> Y
"COVARIANCE=Sxy:"
E/F-XY -> S@
"VAR X:"
B/F-X^2 -> U@
"ST DEV X:"
sqrt U -> U@     sqrt means square root
"VAR Y:"
D/F-Y^2 -> V@
"ST DEV Y:"
root V -> V@
"CORR COEFF=r:"
S/(UV)@
"EQN OF LINE=A+BX:"
"A=":Y-Z(S/U^2)@
"B=":S/U^2@
'FINISHED"