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Re: Freestyle Glucose Meter: Approximate Error Correction?

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Re: Freestyle Glucose Meter: Approximate Error Correction?

Tere21 Oct 2005 18:42
> Thelma Lubkin <thelma@alpha2.csd.uwm.edu> wrote on 11 Oct 2005 23:25:08
> GMT:
[quoted text clipped - 8 lines]
> If the manufacturer were to be cooperative (fat chance), they could be
> corrected _exactly_.

Yes, it could be done exactly, but not trivially.

Each code might represent an entirely different response curve. One
might linear, and other might be a sinusoidal, and so on, with offsets,
scale factors and/or constraints. That's assuming the response curve is
even a function. The mappings from one to the other might be a little
complicated.

A complete set mappings, from every code to every other, would have
n*(n-1)/2 mappings, excluding inverse mappings (twice that with
inverses). My Freestyle Flash has 50 possible codes. 1225 mappings w/o
inverses.

The risk of liabiliy are too high for them to give out this
information.

> This is an instance where technology could (and should) help.  The code
> number should be written onto each strip and read electronically by the
> meter when the strip is inserted into it, thus obviating _another_ source
> of human error.

Another idea would be to build a feature into their PC software to
facilitate code changes.

Alan Mackenzie17 Oct 2005 13:22
Thelma Lubkin <thelma@alpha2.csd.uwm.edu> wrote on 11 Oct 2005 23:25:08
GMT:

>  My husband just noticed that he's gone through about 20 strips with
>  his Freestyle blood glucose monitor code set to 17 when it should have
>  been set to 12. He's not expecting to correct those readings with any
>  precision, but does anyone know at least what direction the correction
>  would go in, and better yet a back of the envelope algorithm for a
>  reasonable guess?

If the manufacturer were to be cooperative (fat chance), they could be
corrected _exactly_.

This is an instance where technology could (and should) help.  The code
number should be written onto each strip and read electronically by the
meter when the strip is inserted into it, thus obviating _another_ source
of human error.

>                           thanks, --thelma

Signature

Alan Mackenzie (Munich, Germany)
Email: aacm@muuc.dee; to decode, wherever there is a repeated letter
(like "aa"), remove half of them (leaving, say, "a").


Thelma Lubkin11 Oct 2005 23:25
My husband just noticed that he's gone through about 20 strips with his
Freestyle blood glucose monitor code set to 17 when it should
have been set to 12. He's not expecting to correct those readings with
any precision, but does anyone know at least what direction the
correction would go in, and better yet a back of the envelope
algorithm for a reasonable guess?

                         thanks, --thelma

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