Correlation Flashcards
1
Q
What is the co-variance?
A
Sxy = sum of the xy - [(sum of x)(sum of y) / n]
2
Q
How can you measure the amount of correlation between two variables?
A
By using the product moment correlation coefficient, r.
r = Sxy / (SxxSyy)^1/2
3
Q
What value of “r” (pmcc) represents a perfect positive linear correlation?
A
r = 1
r=0 shows no linear correlation and r=-1 shows perfect negative correlation
4
Q
Is the product moment correlation coefficient, r affect by coding?
A
NO. NOPE. NEVER.
5
Q
How can the variable x and y be rewritten in coding?
A
p = (x - a) / b
q = (y - c) / d
