Lecture 4: Principles of Psychometrics: Reliability II - jhsph ocw

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Solution 9 Use Spearman-Brown Prophesy Formula Reliability New Scale = N(R)/(1+(N-1)R) N = (number of desired items)/(number of items in observed scale) R = reliability of observed scale For 20 item scale: R = (2*.75)/(1+.75) = .86 For 15 item scale: R = (1.5*.75)/(1+.5*.75) = .82 For 5 item scale: R= (.5*.75)/(1-.5*.75) = .60
Question 10 Two psychiatrists disagree when rating a dichotomous child health outcome among 100 children. In ten of the cases, Dr. Green rated the outcome as present when Dr. Brown rated it as absent. In another ten cases, the reverse occurred; Dr. Brown rated the outcome as present while Dr. Green rated it as absent. If both Dr. Green and Dr. Brown agree that fifty children have the outcome, what will be the value of the Kappa coefficient? If they agree that 70 children have the outcome, will the Kappa be higher or lower?
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• Review of ANOVA Outline • Int
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Are the true means for each group d
Page 7 and 8: . oneway score1 group Analysis of V
Page 9 and 10: . oneway score13 group Analysis of
Page 11 and 12: Overview • Unique Design: Each of
Page 13 and 14: Fixed Design • Total Overlap of R
Page 15 and 16: Types of Reliability • There are
Page 17 and 18: Unique Rater Design ICC Equation to
Page 19 and 20: Between Mean Score Variance Degree
Page 21 and 22: Unique Rater Design (cont’d) 2) W
Page 23 and 24: Unique Rater Design Shortcut: Use p
Page 25 and 26: Important Note 1. Reliability is a
Page 27 and 28: Reliability of Individual Scores in
Page 29 and 30: Fixed Rater Design Recall that the
Page 31 and 32: 5 5.5 6 6.5 7 Rater Mean Variance 1
Page 33 and 34: Steps in Stata 1. Calculate overall
Page 35 and 36: Fixed Rater Design Equation to esti
Page 37 and 38: Random Rater Design: Reliability fo
Page 39 and 40: Summary 1. Unique Rater Design: Eac
Page 41 and 42: Question 1 State the conditions und
Page 43 and 44: Question 2 You have developed a new
Page 45 and 46: Question 3 Doesn’t high reliabili
Page 47 and 48: Question 4 Imagine two graphs, Figu
Page 49 and 50: Question 5 Using observed score as
Page 51 and 52: Question 6 Using observed score as
Page 53 and 54: Question 7 Scenario 1: Reported cor
Page 55 and 56: Question 8 A. How are the alpha and
Page 57: Question 9 For a ten-item scale wit
Page 61 and 62: Question 11 Measures of self-report
Page 63 and 64: Question 12 An 10-item ASP measure
Page 65 and 66: 3. Determine how many items to add
Page 67 and 68: Fixed Effects (a) Set by experiment
Page 69: • We already saw an example of th
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Lecture 4: Principles of Psychometrics: Reliability II - jhsph ocw

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