[R] Possible to use array of spline functions for storing data?

David Winsemius dwinsemius at comcast.net
Sat Mar 6 18:12:42 CET 2010

On Mar 6, 2010, at 11:41 AM, Dieter Menne wrote:

> David Winsemius wrote:
>> Dear listeRs;
>> I am hoping to provide myself the ability to interpolate mortality
>> estimates within intervals for a range of conditions and ages. I have
>> four mortality tables derived from the Society of Actuaries 2001 VBT
>> tables that contains interval mortality rates by starting age and  
>> year
>> of duration. I would like to flexibly interpolate using a large set
>> (~4MM) of ages and conditions as input to small number (~300) of
>> functions, but my toy implementations puzzle me when I examine them,
>> and I cannot seem to store them properly. Say you start with a vector
>> of qx's:
>> ....
> How about using the polynomial representation given be polySpline in  
> package
> splines? It a slightly decorated list of knots and coefficients that  
> could
> be stored in a database.
> Dieter

Thanks, Dieter, that looks very promising. It appears I can do some  
prepocessing and have a reasonably compact object.


David Winsemius, MD
West Hartford, CT

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