POINT BISERAL & PHI COEFFICIENT

Question 1

used to measure the relationship between two variables in situations in which one variable consists of regular, numerical scores, but the second variable has only two values

Answer 1

Point-biserial correlation

Question 2

variable with only two values

Answer 2

dichotomous variable or a
binomial variable

Question 3

• male vs. female
• college graduate vs. not a college graduate
• first-born child vs. later-born child
• success vs. failure on a particular task
• older than 30 years old vs. younger than 30 years old

Answer 3

dichotomous variable or a
binomial variable

Question 4

The dichotomous variable is first converted to numerical values by assigning a value of zero (0) to one category and a value of one (1) to the other category. Then the regular Pearson correlation formula is used with the converted data

Answer 4

compute the point-biserial correlation

Question 5

converted to numerical values by assigning a value of zero (0) to
one category and a value of one (1) to the other category

Answer 5

1st step to compute the point-biserial correlation

Question 6

regular Pearson correlation formula is used with the converted data

Answer 6

2nd step to compute the point-biserial correlation

Question 7

When both variables (X and Y) measured for each individual are dichotomous, the correlation between the two variables is called

Answer 7

phi-coefficient

Question 8

(Φ)

Answer 8

phi

Question 9

1. Convert each of the dichotomous variables to numerical values by assigning a 0 to one category and a 1 to the other category for each of the variables.
2. Use the regular Pearson formula with the converted scores.

Answer 9

compute phi (Φ)