Statistical Analysis for Education and Psychology Researchers

(Jeff_L) #1

**


;
Notes: Data is input after
the cards
statement. ;
Sd is the pooled
standard deviation derived from
both ;
samples.


**;






*****;
data a;
input power alpha diff sd n;
cards;
−9 0.001 0.6 3.676 828
0.80 0.05 0.8 20.715 − 9
;
data a; set a;
pza=abs(probit
(alpha/2)); /
pza=significance level as
a
/


/ z score i.e.
5%=1.96
/
if n=−9 then
do; / Find
n
/
flag=1;
pz=probit
(power); /
pz=cumulative z value
for
/


/ given
power
/
function= (pz +
pza)2; / function=power
function
/
n=ceil((function(sd2
))/(diff
2)) ;
end;
else if power=−9 then
do; /
Find
power /
flag=2;
function=(n
(diff
2))/
(sd**2);


Appendix 359
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