03-19-2015, 06:12 AM

A programme to calculate the probability of the coefficient of correlation having a certain value by chance.

Store x & y data in columns 1 & 2 of statistics aplet & run the programme. The screen will display correlation coefficient R, probability of R arising by chance & relative error of the data to the fitted curve (NOT relative error of R).

SELECT Statistics:

SETINDEP S1;C1:

SETDEPEND S1;C2:

DO2VSTATS S1:

DISP 5;"Rel Error:

"RELERR:

SIZE(C1)-2:

UTPT(Ans,CORR*√Ans/√(1-CORR^2):

DISP 3;" SIG:

"Ans:

DISP 1;"CORR:

"CORR:

FREEZE:

Store x & y data in columns 1 & 2 of statistics aplet & run the programme. The screen will display correlation coefficient R, probability of R arising by chance & relative error of the data to the fitted curve (NOT relative error of R).

SELECT Statistics:

SETINDEP S1;C1:

SETDEPEND S1;C2:

DO2VSTATS S1:

DISP 5;"Rel Error:

"RELERR:

SIZE(C1)-2:

UTPT(Ans,CORR*√Ans/√(1-CORR^2):

DISP 3;" SIG:

"Ans:

DISP 1;"CORR:

"CORR:

FREEZE: