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Mathematical form
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Models death rates and is linear
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Models death probabilities and is non-linear
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Total number of parameters
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Two parameters for each age, one parameter for each year, minus two parameters for identification
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Six parameters to describe the age pattern plus four parameters for each year
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Modeling of the age pattern
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More flexible to capture age-specific effects due to many age-dependent parameters
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Fixed mathematical form to describe the age pattern
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Extrapolation to high ages
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Additional assumptions are required, such as additional parameters and a two-step approach
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Is part of the model. Death probabilities to higher ages are asymptotically equal to parameter g
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Estimating modal age
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Limited, only integer values
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Possible
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Modeling of the mortality trend
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One parameter explains the mortality trends across all ages
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For each age group, there is a parameter to explain the mortality trends
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Ability to distinguish between compression and delay
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Cannot decompose
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Decomposes the two effects and projects them
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Speed of mortality decline
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Death rates decrease exponentially for all ages
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Non-exponential decay for all age groups
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Incorporation of exogenous variables and expert opinion
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Very limited
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Possible
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Ability to use as diagnostic tool
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Not possible
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Possible
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