The document discusses regression fallacies through two real cases involving examinees who took similar tests in 2006 and 2007. Both groups showed slight improvements in their performance scores over time, indicating the presence of regression fallacies despite apparent gains. It highlights how mean values across different social classes were impacted, particularly focusing on performance score levels.

1. Regression)Fallacies)
A)Case)of)Ability)Evalua7on
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Two)Real)Cases )
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6. Two)Real)Cases
2006.4 score
2007.6score
Examinees in group A Examinees in group B
2007.4 score
2008.4score
Examinees took very similar tests twice
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In both the groups, mean values of performance are improved a little bit.

7. Two)Real)Cases
Examinees took very similar tests twice
2006.4 score 2007.6 score 2007.4 score 2008.4 score
lower class
mean
higher class
mean
middle class
mean
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total mean
Examinees in group A Examinees in group B
in both the groups, mean values of performance are improved a little bit.
We)can)s7ll)see)the)regression)fallacies,)although
score)level)1
score)level)2
score)level)3
score)level)4
score)level)1
score)level)2
score)level)3
score)level)4
lower class
mean
higher class
mean
total mean