Effects of Good Teachers on Student Outcomes
These findings would suggest that the difference in achievement gains between having a 25th percentile teacher (a not so effective teacher) and a 75th percentile teacher (an effective teacher) is over one-third of a standard deviation (0.35) in reading and almost half a standard deviation (0.48) in mathematics. Similarly, the difference in achievement gains between having a 50th percentile teacher (an average teacher) and a 90th percentile teacher (a very effective teacher) is about one-third of a standard deviation (0.33) in reading and somewhat smaller than half a standard deviation (0.46) in mathematics. . . . These effects are certainly large enough effects to have policy significance. (p. 253)
Notes:
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/law, govt and politics/politics/domestic policy (0.337500)
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Concepts:
Percentile (0.975860): dbpedia | freebase
Arithmetic mean (0.885570): dbpedia | freebase
Standard deviation (0.865323): dbpedia | freebase
Median (0.844709): dbpedia | freebase
Mean (0.824075): dbpedia | freebase
Statistics (0.823873): dbpedia | freebase | opencyc
Normal distribution (0.783175): dbpedia | freebase
Deviation (0.666890): dbpedia | freebase
Percentile rank (0.659929): dbpedia | freebase
Skewness (0.654562): dbpedia | freebase
Cauchy distribution (0.619200): dbpedia | freebase | yago
How Large Are Teacher Effects?