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The Colorado Growth Model

The Colorado Growth Model. What is the Colorado Growth Model and how is it different from other growth models? How are student growth percentiles interpreted at the individual and aggregated levels? How can a normative growth model support criterion-referenced interpretations?

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The Colorado Growth Model

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  1. The Colorado Growth Model • What is the Colorado Growth Model and how is it different from other growth models? • How are student growth percentiles interpreted at the individual and aggregated levels? • How can a normative growth model support criterion-referenced interpretations? • How are the data displayed and made available to stakeholders?

  2. What is the Colorado Growth Model and how is it different from other growth models? • Growth as an interpretation of current year score – is it expected, or unusual? • Quantile regression model using only prior scores as variables (no demographics etc.) • Percentiles of growth – a normative measure based on concept of academic peers • Comparison to other growth models

  3. How are student growth percentiles interpreted at the individual and aggregated levels? • At individual level – probability and comparison with academic peers • At district, school, other groups – median • Used for accountability calculations as well as less high stakes interpretations

  4. How can a normative growth model support criterion-referenced interpretations? • Using the growth model’s knowledge to predict likelihood of future scores – the concept of catching up/keeping up/moving up (Being on track to attain or maintain proficiency)

  5. How are the data displayed and made available to stakeholders? • Online application (“public” and “private” versions) • Individual student reports (provided to districts) • School and district growth summary reports • Raw and aggregated data available in files

  6. The Colorado Growth Model is open source • Three other states have adopted its calculation method (Arizona, Massachusetts, Indiana) using the open source R package • Several others are considering its adoption • We are building the web application to enable the display of multiple states’ data (requires a creative commons agreement with the state of Colorado)

  7. For more information • http://www.schoolview.org • http://cde.state.co.us/research • E-mail me at bonk_w@cde.state.co.us

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