Student Growth Percentiles

Renaissance Learning · July 24, 2012

Student Growth Percentiles — Renaissance Learning, July 24, 2012.
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July 24, 2012

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  1. The Big Picture Why Growth? Growth and Accountability Future Directions References Student Growth Percentiles Damian W. Betebenner @DBetebenner DBetebenner@nciea.org National Center for the Improvement of Educational Assessment Dover, NH Wisconsin Rapids, Wisconsin July 24th, 2012 D. W. Betebenner Student Growth Percentiles
  2. The Big Picture Why Growth? Growth and Accountability Future Directions References About Me Damian Betebenner Senior Associate National Center for the Improvement of Educational Assessment. Developed student growth percentiles and percentile growth trajectories to help states and educational associations employ student growth in decision making [Betebenner, 2008, Betebenner, 2009, Betebenner, 2012]. Currently refining and sharing these techniques with approximately two dozen other states. D. W. Betebenner Student Growth Percentiles
  3. The Big Picture Why Growth? The Data Revolution Growth and Accountability Lessons Learned Future Directions References From a Paucity to a Plethora of Data The Economist: The Data Deluge More and better organized data: mega, giga, tera, peta, exa, zetta, yotta! Historical records of student achievement Linkage of student achievement to student demographics, teachers, schools, educational programs, . . . Stakeholder interest in an examination of this longitudinal data Interest in examining student achievement over time (student growth) derives from data availability. D. W. Betebenner Student Growth Percentiles
  4. The Big Picture Why Growth? The Data Revolution Growth and Accountability Lessons Learned Future Directions References A Recurring Metaphor Data as a window and a mirror D. W. Betebenner Student Growth Percentiles
  5. The Big Picture Why Growth? The Data Revolution Growth and Accountability Lessons Learned Future Directions References Lessons Learned On Questions John Tukey It is better to have an approximate answer to the right question than a precise answer to the wrong question. On Statistical Models George E. P. Box All models are wrong but some are useful. On Understanding Aristotle We understand best those things we see emerge from their very beginnings. On Accountability Sherlock Holmes It is a capital mistake to theorize before you have all the evidence. It biases the judgment. On Theories of Action Confucius Tell me and I will forget, show me and I will remember, involve me and I will understand. D. W. Betebenner Student Growth Percentiles
  6. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References The Attractiveness of Growth What is growth and why measure it? Student learning is a central goal of education. Assessments of student achievement provide evidence of the current status of student knowledge and understanding. Learning is demonstrated by growth in student achievement from one point in time to another point in time–not by status at either point time alone. Growth Mindset (Dweck:2006). Students with a “growth mindset” outperform those with a “fixed mindset”. D. W. Betebenner Student Growth Percentiles
  7. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References Guiding Questions Growth models address specific questions Different growth analysis techniques are good at answering different questions. It is critical to understand these different questions. Different questions lead to different conversations which lead to different uses and outcomes. Changing conversations about education Starting with the right questions simplifies development and motivating the proper use of the growth model results. The questions set the table for those conversations. Yen (2007) for an excellent list of questions derived from a survey of parent, teachers and administrators D. W. Betebenner Student Growth Percentiles
  8. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References What are the relevant questions for parents? Yen (2007), from a state survey of parents, teachers and administrators, compiled a list of frequently voiced questions/concerns by stakeholder group. Parent Questions Did my child make a year’s worth of progress in a year? Is my child growing appropriately toward meeting state standards? Is my child growing as much in Math as Reading? Did my child grow as much this year as last year? D. W. Betebenner Student Growth Percentiles
  9. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References What are the relevant questions for teachers? Yen (2007), from a state survey of parents, teachers and administrators, compiled a list of frequently voiced questions/concerns by stakeholder group. Teacher Questions Did my students make a year’s worth of progress in a year? Did my students grow appropriately toward meeting state standards? How close are my students to becoming Proficient? Are there students with unusually low growth who need special attention? D. W. Betebenner Student Growth Percentiles
  10. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References What are the relevant questions for administrators? Yen (2007), from a state survey of parents, teachers and administrators, compiled a list of frequently voiced questions/concerns by stakeholder group. Administrator Questions Did the students in our district/school make a year’s worth of progress in all content areas? Are our students growing appropriately toward meeting state standards? Does this school/program show as much growth as that one? Can I measure student growth even for students who do not change proficiency categories? Can I pool together results from different grades to draw summary conclusions? D. W. Betebenner Student Growth Percentiles
  11. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References What are the relevant questions for policy makers? Policy Maker Questions Can/how should student growth be used in judgments of educator quality? Can/how should student growth be used in judgments of education (e.g., school) quality? Are students on track for career and college readiness? What adjustments for student demographics need to be considered? D. W. Betebenner Student Growth Percentiles
  12. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References Describing Student Growth Measuring and communicating student growth is not a simple task. Some believe creating the perfect scale (e.g., height in inches) solves the task of measuring student growth. Even with an interval (or ratio) scale, growth is not easy to interpret. Consider, for example, height. A child might grow 4 inches between ages 3 and 4. 4 inches is a well understood quantity. The 4 inch increase becomes really meaningful only when understood alongside the growth of other 3 to 4 year olds. Student growth percentiles were developed to provide a norm-referenced context for describing student growth. D. W. Betebenner Student Growth Percentiles
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  17. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References Student Growth Percentiles Should we be surprised with a child’s current achievement given their prior achievement? Given a student’s prior scale scores and the associated conditional density, their current scale score corresponds to a percentile of that conditional distribution. This percentile is the student’s growth percentile. Growth percentiles are closely related to estimating the probability of observing a student’s current achievement taking account of their past achievement: SGP = Probability of Current Achievement given Prior Achievement As such, growth percentiles describe the rarity of a student’s current achievement taking account of their prior achievement. D. W. Betebenner Student Growth Percentiles
  18. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References Student Growth Percentiles Should we be surprised with a child’s current achievement given their prior achievement? Student growth percentiles answer this question. Consider a low achieving student with 50th percentile growth and a high achieving student with 50th percentile growth. The low achieving student grew at a rate exceeding 50 percent of similar students. The high achieving student grew at a rate exceeding just 50 percent of similar students. The low achiever’s growth is as exemplary (in a probabilistic sense) as the high achiever’s. However: Judgments about the adequacy of student growth require external criteria. D. W. Betebenner Student Growth Percentiles
  19. The Big Picture Why Growth? Relevant Questions/Concepts Growth and Accountability Describing Student Growth Future Directions Student Growth Percentiles References Establishing growth-standards based upon growth-norms The most common adequacy criterion are judging growth toward an achievement goal (i.e., growth-to-standard). Results from student growth percentile analyses can be used to calculate percentile growth trajectories for each student. These trajectories indicate what future rates of growth will lead to and are used to make adequacy judgments. This growth-to-standard approach was approved as part of Colorado’s successful application to the Growth Model Pilot Program. D. W. Betebenner Student Growth Percentiles
  20. Advanced Reading High Achievement CSAP Reading ● Typical Scale Score Proficient Growth Low ● Level Percentiles High 66th − 99th Typical 35th − 65th Part Proficient ● Low 1st − 34th Unsatisfactory Grade 3 Grade 4 Grade 5 Grade 6 Next Year Scale Score 462 539 563 609 Achievement Level Unsatisfactory Part Proficient Part Proficient Proficient Achievement Growth Percentile 66 66 90 Growth Level High High High Growth
  21. The Big Picture Why Growth? School Accountability Growth and Accountability Student Growth and Value-Added Future Directions Description, Inference, and Causation References Going from Students to Groups of Students It’s of interest to examine schools/classrooms/groups where students demonstrate, on average, extraordinarily high and low student growth. To summarize the student growth percentiles associated with a groups of students (for example, a school) calculate the median of the student growth percentiles. If students were randomly selected, expect to see a median of 50. Values greatly above or below 50 are of interest in identifying best practices or providing extra support. Examining growth with achievement sheds new light on school performance. D. W. Betebenner Student Growth Percentiles
  22. District C: 2008 CSAP Math School Results Student Growth versus Student Achievement by Percent Free/Reduced Lunch School Percent Higher Achievement Higher Achievement Free/Reduced Lunch Lower Growth Higher Growth Percent at/above Proficient in School Less than 20 percent ● 20 to 40 percent ● 40 to 60 percent ● 60 to 80 percent ● More than 80 percent School Size 50 Students 100 Students 200 Students 30 500 Students 1,000 Students 10 Lower Growth Higher Growth Lower Achievement Lower Achievement Median of Student Growth Percentiles in School
  23. The Big Picture Why Growth? School Accountability Growth and Accountability Student Growth and Value-Added Future Directions Description, Inference, and Causation References Growth, Effectiveness, and Value-Added “Good schools” are often called highly effective schools. What’s the relationship between growth and effectiveness? Effectiveness indicates who/what is responsible for the growth (value-added models). RttT has placed teacher responsibility for student progress as a primary issue. D. W. Betebenner Student Growth Percentiles
  24. The Big Picture Why Growth? School Accountability Growth and Accountability Student Growth and Value-Added Future Directions Description, Inference, and Causation References Value-added Analyses/Inferences Who/What is responsible for student growth? Often, analyses of student growth attempt to determine the amount of student progress/growth that can be attributed to the school or teacher. Called Value-added analyses, these techniques attempt to estimate the teacher/school contribution to student achievement. Value-added models quantify effectiveness—purporting to measure the impact on achievement that this school or teacher would have, on average, upon similar students assigned to them. These models and their effectiveness claims are controversial for a number of reasons (EPI (2010), NRC/NAE (2010), Braun (2005), Rubin and Stuart (2004)) . D. W. Betebenner Student Growth Percentiles
  25. The Big Picture Why Growth? School Accountability Growth and Accountability Student Growth and Value-Added Future Directions Description, Inference, and Causation References Value-added Analyses/Inferences Who/What is responsible for student growth? Value-added models are better described as effectiveness models than as growth models. Value-added is an inference – a causal conclusion drawn from the data. Value-added isn’t a type of statistical model or type of assessment (if I showed you the statistical model formulation or an assessment, from the model formulation or assessment you wouldn’t be able to tell me whether it’s value-added). All growth models can be used for value-added purposes but not vice-versa. D. W. Betebenner Student Growth Percentiles
  26. The Big Picture Why Growth? School Accountability Growth and Accountability Student Growth and Value-Added Future Directions Description, Inference, and Causation References Descriptive Questions Note that the questions from Yen’s (2007) survey are primarily descriptive. The questions are only peripherally associated with causation. High stakes accountability has transformed questions about student growth into questions about responsibility/cause: Teacher and School Effectiveness. Beginning with description doesn’t prevent subsequent discussions about responsibility/cause. Beginning with responsibility/cause often prevents discussions about description. D. W. Betebenner Student Growth Percentiles
  27. The Big Picture Why Growth? School Accountability Growth and Accountability Student Growth and Value-Added Future Directions Description, Inference, and Causation References A Recurring Metaphor Data as a window and a mirror D. W. Betebenner Student Growth Percentiles
  28. The Big Picture Why Growth? Accountability 2.0 Growth and Accountability Web 2.0 Technologies Future Directions References Accountability 2.0 “This is the difference between a retrospective question of identifying fault as opposed to a prospective strategy to engineer some corrective measure, almost independent of considering whether there was blame-worthiness. And to move away from the blame-worthiness paradigm toward something that is more regulatory in nature where one might seize upon disparities or circumstances that are for some reason deemed unacceptable and engineer the interventions needed to bring about the necessary change. . . . It’s the no-fault gap closing strategy in which the effort is to build a consensus about a vision of an improved society rather than figure out where’s the person we want to pillory.” C. Edley (2006) D. W. Betebenner Student Growth Percentiles
  29. The Big Picture Why Growth? Accountability 2.0 Growth and Accountability Web 2.0 Technologies Future Directions References Accountability 2.0 Accountability system results can have value without making causal inferences about school quality, solely from the results of student achievement measures and demographic characteristics. Treating the results as descriptive information and for identification of schools that require more intensive investigation of organizational and instructional process characteristics are potentially of considerable value. Rather than using the results of the accountability system as the sole determiner of sanctions for schools, they could be used to flag schools that need more intensive investigation to reach sound conclusions about needed improvements or judgments about quality [Linn, 2008, p. 21]. D. W. Betebenner Student Growth Percentiles
  30. The Big Picture Why Growth? Accountability 2.0 Growth and Accountability Web 2.0 Technologies Future Directions References The Decade of Data Visualization Chart Wars http://infosthetics.com/archives/2010/01/ chart_wars_the_political_power_of_data_ visualization.html Hans Rosling/Gapminder http://www.youtube.com/watch?v=jbkSRLYSojo Journalism in the Age of Data http://datajournalism.stanford.edu/ D. W. Betebenner Student Growth Percentiles
  31. The Big Picture Why Growth? Accountability 2.0 Growth and Accountability Web 2.0 Technologies Future Directions References Web 2.0: Data Visualization and Social Networking With a collaborative spirit, with a collaborative platform where people can upload data, explore data, compare solutions, discuss the results, build consensus, we can engage passionate people, local communities, media and this will raise–incredibly–the amount of people who can understand what is going on. And this would have fantastic outcomes: the engagement of people, especially new generations; it would increase knowledge, unlock statistics, improve transparency and accountability of public policies, change culture, increase numeracy, and in the end, improve democracy and welfare. E. Giovannini, Chief Statistician, OECD. June 2007 D. W. Betebenner Student Growth Percentiles
  32. The Big Picture Why Growth? Growth and Accountability Future Directions References References Betebenner, D. W. (2008). Toward a normative understanding of student growth. In Ryan, K. E. and Shepard, L. A., editors, The Future of Test-Based Educational Accountability, pages 155–170. Taylor & Francis, New York. Betebenner, D. W. (2009). Norm- and criterion-referenced student growth. Educational Measurement: Issues and Practice, 28(4):42–51. Betebenner, D. W. (2012). Growth, standards, and accountability. In Cizek, G., editor, Setting Performance Standards: Foundations, Methods, and Innovations, pages 439–450. Routledge, New York. Braun, H. I. (2005). Using student progress to evaluate teachers: A primer on value-added models. Technical report, Educational Testing Service, Princeton, New Jersey. Economic Policy Institute (2010). Problems with the use of student test scores to evaluate teachers. Technical report, Washington, D.C. Downloaded August 30th, 2010 from http://epi.3cdn.net/724cd9a1eb91c40ff0_hwm6iij90.pdf. Edley, C. (2006). Educational “Opportunity" is the highest civil rights priority. So what should researchers and lawyers do about it? Retrieved June 22, 2006 from the World Wide Web: http://www.softconference.com/MEDIA/WMP/260407/#43.010. Linn, R. L. (2008). Educational accountability systems. In The Future of Test-Based Educational Accountability, pages 3–24. Taylor & Francis, New York. National Research Council and National Academy of Education Getting value of out value-added: Report of a workshop. Technical report, Washington, D.C. Commitee on Value-Added Methodology for Instructional Improvement. Rubin, D. B., Stuart, E. A., and Zanutto, E. L. (2004). A potential outcomes view of value-added assessment in education. Journal of Educational and Behavioral Statistics, 29(1):103–116. Yen, W. M. (2007). Vertical scaling and No Child Left Behind. In Dorans, N. J., Pommerich, M., and Holland, P. W., editors, Linking and Aligning Scores and Scales, pages 273–283. Springer, New York. D. W. Betebenner Student Growth Percentiles