The difference in the mean cumulative function between groups is the MCF for the first group minus the MCF for the second.

The standard error of the difference between the mean cumulative functions for two groups is the square root of the sum of the variances of the two groups.

Term | Description |
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estimated difference in the mean cumulative function | |

estimated standard error of the difference in the mean cumulative function | |

z_{α} | the 1 – ( α / 2) percentile of a standard normal distribution where 100 – α % is the confidence level |