| 8/16/2007 |
The confidence intervals for death rates statistics for all races (combined) were based on the Fay/Feuer method.
The confidence intervals were updated to use the Tiwari method to be consistent with rest of the web site (including the race subgroups).
In general, the change was made to use the Tiwari method because the modifications of the gamma (rates) and F intervals (rate ratios) in the
Tiwari method are more efficient in the sense that they have empirical coverage probabilities less than or equal to their counterparts and
also retain the nominal level.
Tiwari RC, Clegg LX, Zou Z. Efficient interval estimation for age-adjusted cancer rates. Stat Methods Med Res 2006 Dec;15(6):547-69.
Fay MP, Feuer EJ. Confidence intervals for directly standardized rates: a method based on the gamma distribution. Stat Med 1997 Apr 15;16(7):791-801.
Fay MP. Approximate confidence intervals for rate ratios from directly standardized rates with sparse data. Communications in Statistics: Theory and Methods 28(9),2141-60.
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Upper confidence intervals for all races (combined) in the:
Death Rates Table,
Interactive Maps,
Comparative Data Display, and
Rate/Trends Comparison. |
