Point biserial correlation is used as a measure of relationship between two variables when one variables falls in a continuous scale and other is in the state of natural or genuine dichotomy. This presentation slides describes the concept and procedures for computing point biserial correlation.

1. Point
Biserial
Correlation
rp, bis
K.THIYAGU,
Assistant Professor,
Department of Education,
Central University of Kerala, Kasaragod

2. Point Biserial Correlation
• Genuine or
Natural
Dichotomy
• Continuous
One
Variable
Other
Variable
Estimating the relationship
between two variables when one
variables is in a continuous state
and other is in the state of a
natural or genuine dichotomy.
The Term ‘Dichotomous’ means cut
into two parts or divided into two
categories
rp, bis

3. A point-biserial and biserial correlation is
used to correlate a dichotomy with an
interval scaled variable.
Point-biserial correlation is used when the dichotomous
variable is a true or discrete dichotomy.
The biserial correlation is used with an
artificial dichotomy.

5. Formula for Point Biserial
Correlation is
Where
rpbis = Point biserial correlation
Mp = Mean of the 1st group
Mq = Mean of the 2nd group
P = Proportion of 1st group
Q = Proportion of 2nd group
 = Standard Deviation of the total group

7. Thank You
K.THIYAGU, Assistant
Professor, Department of Education,
Central University of Kerala, Kasaragod