The table below is mentioned in footnote 20 in the *Sociological Methods and Research* article. As discussed in that footnote, this table presents the probability of at least one person from the NSPE screener-sample participating in protest events of various sizes. See footnote 20 in the article text for more details.

** Table A1: Relationship Between Protest Size and Likelihood of Inclusion in the NSPE**

Protest Size | Probability of Participation | Probability that none of screener-sample members participated in protest of this size | Probability that at least one screener-sample member participated in protest of this size |

10 | 4.26E-08 | 0.999 | 0.001 |

50 | 2.13E-07 | 0.995 | 0.005 |

100 | 4.26E-07 | 0.989 | 0.011 |

200 | 8.53E-07 | 0.979 | 0.021 |

500 | 2.13E-06 | 0.948 | 0.052 |

1,000 | 4.26E-06 | 0.898 | 0.102 |

5,000 | 2.13E-05 | 0.583 | 0.417 |

10,000 | 4.26E-05 | 0.340 | 0.660 |

20,000 | 8.53E-05 | 0.116 | 0.884 |

30,000 | 1.28E-04 | 0.039 | 0.961 |

40,000 | 1.71E-04 | 0.013 | 0.987 |

50,000 | 2.13E-04 | 0.005 | 0.995 |