Data are from Atkinson and Polivy (1976). ``Effects of delay, attack, and retaliation on 
state depression and hostility,'' Journal of Abnormal Psychology, 85:570-576.

40 men were enrolled in a study on reactions to unprovoked verbal abuse. 10 men each were 
randomized to receive one of four types of verbal abuse: 

   -- insult given to them with retaliation allowed
   -- insult given to them without retaliation allowed
   -- apology with retaliation, and 
   -- apology without retaliation. 

The outcome is a measure of the men's hostility towards the situation.

Data are coded as 1 = yes and 2 = no.