Abbreviated Interrupted Time-Series - Institute for Policy Research

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Problematically • Different combinations of these have different distributions, e.g., – Binomial for counts with fixed n of trials – Poisson for rates with variable n of trials • HLM usually assumes normally distributed data. – One can change this, but – It isn’t clear HLM how can allow different distributions for different studies in the same meta‐analysis.
So We Are Working On • Categorizing the different kinds of metrics and associated distributions, and • Seeing whether they can be modeled correctly in programs like HLM or WINBUGS.
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Abbreviated Interrupted Time‐Seri
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The effect can be a change in inter
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The effect can be a change in slope
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The effect can be delayed in time.
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Interrupted Time Series Can Provide
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Meeting ITS Conditions in Education
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• O X O Theoretical Rationales fo
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O O O X O • Initial standing asse
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Threats to Validity: History • Wi
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Threat to SCV • When a treatment
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External Validity • The essence o
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O X O O O • Now we add a comparis
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O O O X O O O O O • Now mean diff
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Results: Percent of Students Obtain
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Adding a nonequivalent dependent va
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Note that the outcome variable (ope
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Only the targeted dependent variabl
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Example: Evaluating No Child Left B
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Contrast Type 1 & 2 • Contrast 1:
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Hypothetical NCLB effects on public
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Analytic Model • NCLB Public vs.
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Main NAEP 4 th grade math scores by
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Difference in differences in Total
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Main NAEP 8 th grade math scores by
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Trend NAEP Time Series Graphs Publi
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Trend NAEP 8 th grade math scores b
Page 53 and 54: Public vs Private School Findings
Page 55 and 56: Contrast 2: Comparing States that v
Page 57 and 58: Evidence of Differing Standards Hig
Page 59 and 60: Main NAEP Time Series Graphs States
Page 61 and 62: ], ) ( ) ( ) ( [ ) _ _ ( ) _ _ ( )
Page 63 and 64: Main NAEP 4 th grade math scores by
Page 65 and 66: Difference in differences in 2009 T
Page 67 and 68: Overall Conclusions • Similar res
Page 69 and 70: Basic Insight of D & J • NCLB pas
Page 71 and 72: D & J Results: 4 th Grade Math
Page 73 and 74: Dee and Jacob Results • Similar c
Page 75 and 76: 4 th Grade Reading
Page 77 and 78: The Use of Multiple Comparison Grou
Page 79 and 80: Adding Treatment Introduction and R
Page 81 and 82: Medication decreased hyperactivity,
Page 83 and 84: Example: Chorpita • A child with
Page 85 and 86: Multiple Baselines on Different Uni
Page 88 and 89: The effects of screening for phenyl
Page 90 and 91: Multilevel Models: Current Work •
Page 92 and 93: Potential drawbacks of using HLM to
Page 94 and 95: Stuart Data Example (Stuart, 1967)
Page 96 and 97: Level 2 data: Persons Level-2 data
Page 98 and 99: HLM: Linear Model Estimates Final e
Page 100 and 101: HLM Output from Quadratic Model: Fi
Page 102 and 103: So Simple: What Could Go Wrong? •
Page 106 and 107: Do you have any examples to share w
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