PPT Slide

SIMPSONíS PARADOX

(1951 ñ 1994)

T ñ Treated T ñ Not treated

R ñ Recovered R ñ Dead

M ñ Males M ñ Females

Easy question (1950-1994)

• When / why the reversal?

Harder questions (1994)

• Is the treatment useful? Which table to consult?

• Why is Simpsonís reversal a paradox?

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