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The average annual percent change over several years. The APC is used to measure trends or the change in rates over time. For information on how this is calculated, go to Trend Algortihms in the SEER*Stat Help system. The calculation involves fitting a straight line to the natural logarithm of the data when it is displayed by calendar year.

- Browse Related Terms: Age-Conditional Risk, Annual Percent Change (APC), Confidence Interval, Incidence Rate, Joinpoint, Joinpoint Software, Lifetime Risk, Percent Change, Probability, Probability of Developing Cancer, Probability of Dying of Cancer, Spatial Correlation, statistically significant, Trends Over Time