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Fwd: T in $DES

From: Matts Kågedal <mattskagedal>
Date: Tue, 6 Jul 2021 14:44:48 +0200

Hi all,
I have a question regaring T in $DES.
I have a time-varying covariate that is derived based on an explicit
equation and then use in a differential equation.
I got some funny results in the output table and investigated a bit
further.

I therefore derived T_DAY=T in $DES as below and output it in $TABLE.
Why is T_DAY at TIME=0 equal to the time of the last observation for the
patient? I was expecting it to be Zero (same as Time). Seems to be the same
for all IDs in the dataset.
Below is the output created in $TABLE including the "derived" variable
T_DAY.
Any advice would be appreciated.
Matts Kågedal

[image: image.png]

[image: image.png]

image.png
(image/png attachment: image.png)

image.png
(image/png attachment: 02-image.png)

Received on Tue Jul 06 2021 - 08:44:48 EDT

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