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Cap l sub t comma sub a comma sub i equals the time period during which the target period (t) was occurring and the person was at least a sub 1 years old, but not yet a sub 2 years old. This is represented symbolically by open square bracket cap d cap o cap b sub i, cap m cap o cap b sub i, cap y cap o cap b sub i, plus a sub 1 comma cap d cap o cap b sub i, cap m cap o cap b sub i, cap y cap o cap b sub i, plus a sub 2 close parenthesis.

Return to Appendix B, Fifth Equation