1 / 9

POINT BISERIAL COEFICIENT OF CORRELATION (rpb)

POINT BISERIAL COEFICIENT OF CORRELATION (rpb). Casimiro , Haizelyn N. Endaya , Dominique Francesca E. Grumo , Rona Rose A. The point biserial correlation is a measure of association between a continuous variable and a binary variable (Simon, 2005-2008).

odessa-cantrell
Download Presentation

POINT BISERIAL COEFICIENT OF CORRELATION (rpb)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. POINT BISERIAL COEFICIENT OF CORRELATION (rpb) Casimiro, Haizelyn N. Endaya, Dominique Francesca E. Grumo, Rona Rose A.

  2. The point biserial correlation is a measure of association between a continuous variable and a binary variable (Simon, 2005-2008). • The formula, according to Vizcarra, 2003:

  3. Where: • = Point biserialcoefficient • = Mean of the interval or ratio scale variable of one group (x) • = Mean of the other group (y) • = Number of population of one group • = Number of population in the other group • = Total number of population () • = Standard Deviation of the two groups

  4. EXAMPLE: The researcher would like to determine if the scores of 16 students of the same school on a 20-point math test is associated with their gender.

  5. STEPS: • Compute the mean of X1 and X2. = 11.87 = 12 • Compute the standard deviation of X and Y using the formula:

  6. Substitute in the formula of rpb: Negligible Correlation

  7. Testing the significance of rpb: • The point biserial coefficient of correlation is a special case of Pearson r and its interpretation is similar to each other. The t-test for rpb is used to determine their significant relationship. • Computed t = 0.064 • Critical t at .05 with 14 df = 2.14 • Decision = Not Significant

  8. End of Presentation Thank you

  9. References • [Simon, 05-08] Simon, Steve (2005-2008). Retrieved August 31,2009. Stats: What is a point biserial coefficient correlation?. Website: http://www.cmh.edu/stats/definitions/biserial.htm • [Vizcarra, 03] Vizacrra, Florante O., Ed. D.(2003) . Introduction To Educational Research

More Related