Lecture 4: Principles of Psychometrics: Reliability II - jhsph ocw
Lecture 4: Principles of Psychometrics: Reliability II - jhsph ocw
Lecture 4: Principles of Psychometrics: Reliability II - jhsph ocw
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
3. Determine how many items to add<br />
by using Spearman-Brown<br />
prophesy formula.<br />
4. Solve for N<br />
Solution 12 (cont’d)<br />
Solution: The ASP scale must have ≥12 items for an expected observed<br />
correlation with HIV risk-behavior <strong>of</strong> .35 or greater.