OpenIntro Statistics Dataset - mail_me


This dataset was taken from the list of OpenIntro dataset files found at

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This study investigated whether finding a coin influenced a person'slikelihood of mailing a sealed but addressed letter that appeared to havebeen accidentally left in a conspicuous place. Several variables werecollected during the experiment, including two randomized variables ofwhether there was a coin to be found and whether the letter already had astamp on it.


  • stamped - a factor with levels no yes
  • found_coin - a factor with levels coin no_coin
  • gender - a factor with levels female male
  • mailed_letter - a factor with levels no yes


Levin PF, Isen AM. 1975. Studies on the Effect of Feeling Good onHelping. Sociometry 31(1), p141-147.


The precise context was in a phone booth (this study is from the 1970s!),where a person who entered a phone booth would find a dime in the phonetray, which would be sufficient to pay for their phone call. There was alsoa letter next to the phone, which sometimes had a stamp on it.

Taken from:

Title Authored on Content type
R Dataset / Package psych / bfi March 9, 2018 - 1:06 PM Dataset
OpenIntro Statistics Dataset - scotus_healthcare August 9, 2020 - 2:38 PM Dataset
R Dataset / Package psych / withinBetween March 9, 2018 - 1:06 PM Dataset
R Dataset / Package Stat2Data / Kids198 March 9, 2018 - 1:06 PM Dataset
R Dataset / Package Ecdat / Wages1 March 9, 2018 - 1:06 PM Dataset
Attachment Size
dataset-132682672.csv 1.17 KB
Dataset License
Documentation License
No license (All rights reserved)