一两年前看教育局官网关于计算OC 分数的算法总结的笔记, 记得Selective school也是同样的算法, 实际上大学老师的朋友(在加拿大)看过也说她给学生学期末打分也是类似的算法.
这里有些地方可能有点旧了, 比如当时还是GA科目, 没关注OC是不是也改成Thinking skills, 以及总分还是300, 现在不记得是多少了, 不过算法上面应该还是一致的, 随便看看吧.
1. School assessment scores are provided for English and mathematics. They rank all candidates from a particular primary school applying for opportunity class placement in order of merit, showing the relative gaps between the students.
2. Submitted school assessment scores are adjusted through a process of moderation to allow comparison of student scores from different schools. The scores are adjusted based on that group's performance in the Opportunity Class Placement Test.
3. The mean (average) and standard deviation (spread of scores) of the English and mathematics tests are calculated for all students from each primary school who sat the test. The mean and standard deviation are then applied to the school assessment scores. This method ensures the rank order and relative gaps between students at a school stays the same. (学校给分高低, 并不是学校好坏排名决定, 而是你在今年本学校里面的rank以及今年本校所有参加考试的学生的mean值和standard deviation来计算得出)
4. The scaling of the test marks is done on a statewide basis regardless of the schools attended by the students. Each test component is adjusted so they are weighted equally and have equal weighting with the moderated school assessment scores.
Different maximum marks apply to the various test components.
* English – 20
* mathematics – 20
* general ability – 30
Each component of the Opportunity Class Placement Test is scaled to a mean of 60 and a standard deviation of 12.
The following graph shows an example of scaling for the mathematics test. In the example a raw mark of 17 out of 40 was scaled to 60 out of 100 with a standard deviation of 12 – 68% of the candidates received a scaled mark of between 48 and 72.
5. The school assessment scores are scaled just like the test results, using the mean and standard deviation from candidates from one school. These are applied to the raw scores provided by that school. This gives the raw school assessment scores parity with all schools statewide – giving them equal weighting with the scaled test scores.
For example, in 2015 a sample school with 64 candidates had school assessment scores for mathematics with a mean of 83 and a standard deviation of 13. When those students sat the mathematics test their scaled scores had a mean around 65 and a standard deviation around 14. You can see the results of the scaling of these assessment scores in the graph below.
6. The calculated placement score is a mark out of 300. For most students it is provided at the bottom of the email advising the application outcome.
The calculated placement score is made up of:
* moderated school assessment scores for English and mathematics
* scaled test marks for English
* scaled test marks for mathematics
* scaled test marks for general ability.
Test component Scaled school assessment score Scaled test mark Total
English 50 50 100
Mathematics 50 50 100
General ability No school score 100 100
Total 100 200 300
7. Outcome emails and letters advise parents of their child’s calculated placement score. A further letter or attachment is provided with the breakdown of the raw school assessment scores and test marks. In a few cases the score cannot be published. If parents do not receive their child’s score they can write to the Team for an explanation.
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