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AW: [NMusers] $Error log transformed

From: Katrin Volz <ankekatrin.volz_at_uni-saarland.de>
Date: Sat, 17 Dec 2016 19:46:00 +0100

Hey Rob,

 

Thank a lot. It seems to work well.

Im quite happy with this log transformation :)

And yes, thanks for clarifying that I have to take the natural =
logarithm.

 

Cheers

Katrin

 

 

Von: owner-nmusers_at_globomaxnm.com [mailto:owner-nmusers_at_globomaxnm.com] =
Im
Auftrag von R.terHeine_at_radboudumc.nl
Gesendet: 16 December 2016 11:24
An: ankekatrin.volz_at_uni-saarland.de; nmusers_at_globomaxnm.com
Betreff: RE: [NMusers] $Error log transformed

 

Hi Katrin,

You’ll have to take the natural logarithm of your DVs

 

I would change your error block to:

 

$ERROR

IPRED=LOG(F+1E-16) ; Protection against LOG(0) in case of dosing =
events etc

Y=IPRED+ERR(1) ; FOR PROPORTIAL ERROR

 

Cheers!

Rob

 

 

Van: owner-nmusers_at_globomaxnm.com <mailto:owner-nmusers_at_globomaxnm.com>
[mailto:owner-nmusers_at_globomaxnm.com] Namens Katrin Volz
Verzonden: vrijdag 16 december 2016 10:35
Aan: nmusers_at_globomaxnm.com <mailto:nmusers_at_globomaxnm.com>
Onderwerp: [NMusers] $Error log transformed

 

Dear All,

 

I would like to model my data log transformed.

So far, I already found some suggestions for this problem here but none =
of
them worked in my case - probably I did sth. wrong.

 

I would be very happy if someone could help me with changing my error =
model,
which I assume has to be changed.

(I also assume that the dataset has to be changed from DV to LOG(DV)?)

 

So, here is the code I used so far (not log transformed):

 

$ERROR

IPRED = F ;IPRED =
drug in
the central compartment

IF (CMT.EQ.5) IPRED = A(5) ;IPRED second drug in 5th
compartment

 

DEL=0

IF (IPRED.EQ.0) DEL=0.0001

W = F

IRES = DV - IPRED

IWRES = IRES /(W + DEL)

 

Y = IPRED + IPRED * EPS(1) ; error =
drug in
the central compartment

IF (CMT.EQ.5) Y = IPRED + IPRED * EPS(2) ; error second drug in =
5th
compartment

 

It would be great to get some help.

Thanks!

Katrin

 

 

 

 

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Received on Sat Dec 17 2016 - 13:46:00 EST

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