Abbreviated Interrupted Time-Series - Institute for Policy Research
Abbreviated Interrupted Time-Series - Institute for Policy Research
Abbreviated Interrupted Time-Series - Institute for Policy Research
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So Contrast 2 is…<br />
• Compare states at three levels of standards ‐<br />
high, medium and low<br />
– Cut offs at 50% and 75% of students being<br />
proficient<br />
• Hypothesis is that in states with higher<br />
standards there should be more of a post‐<br />
2002 change in mean, slope or both<br />
• Using Main NAEP data from 1990 to 2009 <strong>for</strong><br />
Math and to 2007 <strong>for</strong> 4th grade Reading