Formula summary  
Alabama  None evident 
Alaska  100point scale with weighting for various indicators 
Arizona  State statute requires that half of the letter grade determinations for schools and LEAs should consist of academic progress. The academic progress measurement consists of the relative growth of all pupils enrolled at the school or LEA and the relative growth of 25 percent of pupils with the lowest academic performance measurement enrolled at the school or LEA. In order to comply with statute and offer more sensitive measures of school accountability, the Arizona Department of Education (ADE) uses parallel models to evaluate the following types of schools: 1. Traditional schools 2. Alternative schools 3. Small schools 4. K2 schools 
Arkansas  Schoollevel Individualized Annual Measurable Objectives (AMOs)
The Annual School Performance Rating System is based on augmented benchmark scores for grades 38, EndofCourse Algebra, EndofCourse Geometry, and Grade 11 Literacy Exams. School ratings include two categories: gains or improvement (changes in student performance across two adjacent years) and status (student performance from one year).
https://adedata.arkansas.gov/arc/

California  AB 484 (2013) modified so that beginning with the 2015–16 API cycle: State assessment results may only constitute 60% of a high school’s API 40% must be from other indicators such as career and college readiness, graduation data, etc. Academic Performance Index (API) Details continue to evolve. The Academic Performance Index (API) is a score on a scale of 200 to 1,000 that annually measures the academic performance and progress of individual schools in California. The state has set 800 as the API score that schools should strive to meet. 
Colorado  Colorado Growth Model is both

Connecticut  School performance index with weighted indices 
Delaware  Growth model 
District of Columbia  Classification system based on student proficiency and growth to provide each school with a school index score (covering all students), and a subgroup index scores for all subgroups for which the school is accountable. Index scores identify highperforming, highprogress, and struggling schools on an annual basis. 
Florida  Revised 2014, effective 201415 school year. Details coming. 
Georgia  Star Ratings beginning 20132014 College and Career Ready Performance Index Score 
Hawaii  None specified 
Idaho 
100point scale
Under the FiveStar System, schools with grades K8 are measured based on the following factors:
Under the FiveStar System, schools with a grade 12 are measured based on the following factors:
After calculating these measures, each school receives a Star Rating.

Illinois  None specified 
Indiana  100point scale index 
Iowa  None specified 
Kansas  None specified 
Kentucky  
Louisiana 

Maine  None specified 
Maryland  School Progress Index 
Massachusetts  Progress and Performance Index (PPI) Points assigned as Above Target, On Target, Improved Below Target, No Change or Declined  across 4 core indicators Above Target (100 points) On Target (75 points) Improved Below Target (50 points) No Change (25 points) Declined (0) 
Michigan  Based on target areas: In general, meeting a target will yield 2 pts or the full point value. Meeting a target through safe harbor or improvement will yield 1 point or half the point value (NOT true for Ed Evals and Compliance Factors targets) Not meeting a target will yield 0 points. Determine the school’s % points received and apply it to the color scale: Green: pts >85% Light Green: 70%85% Yellow:: 60%70% Orange: 50%60% Red: pts<50% http://www.michigan.gov/mde/0,4615,714022709_25058,00.html 
Minnesota  Multiple Measurements Rating (MMR) Uses four ratings, weighted equally, to measure school performance: • Proficiency  Schools earn points in the MMR by meeting AYP proficiency goals in individual student subgroups. The percentage of subgroups that make AYP determines the percentage of points a school receives. • Growth  Students are measured by their current performance on the Minnesota Comprehensive Assessments (MCAs) as relative to their performance in the most recent year they took the test. Each student receives a growth score, and schools get a growth score based on the average growth of all students in the school. • Achievement Gap Reduction  Schools are measured based on how the growth of their students from the seven lowerperforming subgroups (Black, Hispanic, Asian, American Indian, English Learners, free and reduced lunch, and special education students) compares to the statewide average growth of higherperforming subgroups. Schools earn MMR points based on their ability to reduce the achievement gap. This measurement answers the question, “Is the growth of my lowerperforming students such that it is reducing the achievement gap?” • Graduation rate  Schools earn points through the same methodology as proficiency: by the percentage of the subgroups that reach the AYP target for graduation rates. Minnesota is using a new, federallymandated, cohortadjusted graduation rate calculation methodology.
In summary, the MMR is generated by dividing the total number of points earned by the total number of points possible. The percentage of possible points that each school earns will generate a Multiple Measurements Rating (MMR). 
Mississippi  Annual Performance Report Score Once the scores for Academic Achievement, Subgroup Achievement, College and Career or High School Readiness, Attendance Rate and Graduation Rate have been generated, they are combined into a single score. The APR score is used to differentiate among LEA performance, and to make classification determinations of accreditation, Accredited with Distinction, Accredited, Provisional and Unaccredited. 
Missouri  Annual Performance Report Score (APR) Total points earned is divided by the total points possible for the school or LEA then multiplied by 100 to determine the percent of points earned rounded to the tenth. The total percent of points possible earned is then used at the district level to determine a district’s accreditation status. The accreditation status of three (3) consecutive APRs is then used to inform district classification recommendations to the State Board of Education. 
Montana  None specified (except for determining AYP) 
Nebraska  Status scores Status is calculated by determining the average of all the students’ scale scores. For example in reading for grades 35, all the students’ scale scores for reading will be added together and divided by the number of students. Improvement Scores Improvement is calculated as the average scale score for all students in a group (i.e. third grade) one year compared to average scale score of the students in the same group (i.e. third grade) the next year. For example, all scores for students in grade 3 are averaged. The second year the scores are averaged for all students in grades 3. The difference in the two averages is the improvement. The two groups contain different individuals. Growth Scores Growth is a calculation in which the scale scores of the same individual students are matched—and the differences found. For example, student A takes the reading test in grade 3. He earns a 135 scale score. In grade 4 the same student takes the 4th grade reading test and earns a 140 scale score. His scale score from grade 3 is subtracted from the scale score for grade 4; the difference of 5 points is the growth. The differences in scale scores are averaged for all students in the group. For growth to be included for a student, the student must be in the same school district both years of the NeSA testing. 
Nevada  Index The Nevada School Performance Framework or NSPF produces an index score based on 100 points for each of Nevada's public schools. The basis was determined using the performance of Nevada schools from the 20102011 school year. These thresholds determine leveled criteria that are rooted in the relative performance of Nevada schools. All of the indicators in the NSFP are measured against established criteria which define 5 levels. The maximum points possible for each indicator are determined by schools that perform at the 95th percentile of schools in that index. In this way, the NSPF sets high but attainable goals for all of Nevada's schools. The indicator levels and associated points can be found on the tables in the full text field. 
New Hampshire  None specified 
New Jersey  Calculation of Annual Progress Targets, which are indicators to measure schools’ progress toward meeting the State proficiency benchmark of 90% 
New Mexico 
Schools are grouped into categories that have similar proportions of English language learners (ELL), students with disabilities (SWD), ethnicities, economically disadvantaged (ED), and mobile students. Different schools are in each category set. A composite score incorporates all categories into a general measure of atrisk students. Higher ranking schools had more points in that indicator.
Scaled scores (SS) range from 0 to 80, and 40 is the threshold for proficiency (on grade level). For a more detailed history see the NMPED website: http://www.ped.state.nm.us/AssessmentAccountability/AcademicGrowth/NMSBA.html

New York  Proficiency and growth 
North Carolina 
0point grading system with each school being designated as an A, B, C, D, or F
and
potential inclusion of SAS’s Education ValueAdded Assessment System (EVAAS) for measuring school growth.

North Dakota  None specified (except for determining AYP) 
Ohio  Performance Index Performance Indicators 
Oklahoma  1. Fifty percent (50%) on whole school performance, as measured by allocating one point for each student who scores proficient or advanced on the criterionreferenced tests and endofinstruction tests and alternative test scores divided by the number of students taking the tests; 2. Twentyfive percent (25%) on whole school growth, as measured by allocating one point for each student who improves proficiency levels or improves substantially within a proficiency level on criterionreferenced tests and endofinstruction tests divided by the number of students taking the tests; and 3. Twentyfive percent (25%) on growth in the bottom quartile of students, as measured by allocating one point for each student in the bottom quartile who improves proficiency levels or improves substantially within a proficiency level on criterionreferenced tests and endofinstruction tests divided by the number of students taking the tests. 
Oregon  Growth model. Oregon’s approved ESEA waiver application shifts the emphasis to whether schools are helping individual students improve performance from one year to the next, and whether each student is on a trajectory towards eventual college and career readiness. Sources: http://www.ode.state.or.us/superintendent/priorities/oregoneseaflexibilityapproved_execsummary.docx http://www.ode.state.or.us/wma/policy/accountability/growth/studentgrowthpercentilesfaq.pdf 
Pennsylvania  Growth model 
Rhode Island  Composite Index Score (CIS) 
South Carolina  Index  Absolute Ratings Index  Growth South Carolina uses a separate system for schools enrolling students in only grade two or below. See full text field for more details. 
South Dakota  Index Accountability system is based on a 100point index, called the School Performance Index, or SPI. The SPI consists of key indicators to measure a school’s performance. A numeric value is assigned to each of the indicators. These values are added to create a total SPI score out of 100 points. Two distinct indexes are used: 1) one for elementary/middle school accountability, and 2) one for high school accountability. Portions of the indexes will be phased in, with full implementation in the 201415 school year. Two metricseffective teachers and principals and school climatewill take effect with the 201415 school year. 
Tennessee  Tennessee Value Added Assessment System Grade Scale 
Texas  Index (Performance index framework considers four areas (including student groups that are part of that index)) 
Utah  A, 100%  80%; B, 79%  70%; C, 69%  60%; D, 59%  50%; and F, 49% or less. When 85% of schools receive an A or B, the State Board of Education is to increase the endpoints of the ranges by five percentage points, except the lower endpoint of the A range may not be greater than 90%. The board is to lower a school’s grade by one letter grade if: (a) student participation in a statewide assessment is fewer than 95%; or (b) the participation of nonproficient students as determined by prior year test scores is fewer than 95%. 
Vermont  None specified 
Virginia 
Annual accountability ratings are based on achievement during the previous academic year or combined achievement from the three most recent years. School accreditation and federal accountability ratings for a specific school year are based on student achievement on tests taken during the previous academic year.
Source: report cards https://p1pe.doe.virginia.gov/reportcard/report.do?division=All&schoolName=1548 
Washington  Index 
West Virginia  100point index 
Wisconsin  Index 
Wyoming  Index 
American Samoa  None evident 
Guam  Weighted average of numerical equivalents using a combination of indicators appropriate for each level. Extra credit for increasing percentage of students performing at proficient and advanced levels by at least 5 percentage points compared to previous year. 
Puerto Rico  None evident except Adequate Yearly Progress status 
Virgin Islands  None evident 
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