>
> -Original Message-
> From: R-help On Behalf Of Duncan Murdoch
> Sent: Tuesday, December 21, 2021 5:26 AM
> To: Marc Girondot ; r-help@r-project.org
> Subject: Re: [R] Creating NA equivalent
>
> On 20/12/2021 11:41 p.m., Marc Girondot via R-help wrote:
> > De
On Tue, 21 Dec 2021 05:41:31 +0100
Marc Girondot via R-help wrote:
> Dear members,
>
> I work about dosage and some values are bellow the detection limit. I
> would like create new "numbers" like LDL (to represent lower than
> detection limit) and UDL (upper the detection limit) that behave li
im Lemon
Sent: Tuesday, December 21, 2021 5:00 PM
To: Avi Gross
Cc: r-help mailing list ; Adrian Dușa
Subject: Re: [R] Creating NA equivalent
Please pardon a comment that may be off-target as well as off-topic.
This appears similar to a number of things like fuzzy logic, where an instance
one category of NA that sounds a bit like what you want. His
> > > functions should allow the creation of such data within R, as well. I am
> > > including him in this email if you want to contact him or he has
> > > something to say.
> > >
> > >
>
> > category of NA that sounds a bit like what you want. His functions should
> > allow the creation of such data within R, as well. I am including him in
> > this email if you want to contact him or he has something to say.
> >
> >
> > -----Original Me
nctions should
> allow the creation of such data within R, as well. I am including him in this
> email if you want to contact him or he has something to say.
>
>
> -Original Message-
> From: R-help On Behalf Of Duncan Murdoch
> Sent: Tuesday, December 21, 2021 5:
ct: Re: [R] Creating NA equivalent
On 20/12/2021 11:41 p.m., Marc Girondot via R-help wrote:
> Dear members,
>
> I work about dosage and some values are bellow the detection limit. I
> would like create new "numbers" like LDL (to represent lower than
> detection limit) and U
variable (e.g., viral load due
>> to some lower detection limit) does not make a fundamental difference. In
>> fact,
>> the type of model you are thinking of with 2) is a Tobit model, which can be
>> fitted using the survival package (or censReg).
>>
>> Best,
>&
the type of model you are thinking of with 2) is a Tobit model, which can be
> fitted using the survival package (or censReg).
>
> Best,
> Wolfgang
>
>>-Original Message-
>>From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Chris Evans
>>Sent: Tu
gt;Subject: Re: [R] Creating NA equivalent
>
> I am neither a programmer nor a professional statistician but this topic
> interests me because:
>
> 1) I remember from long, long ago that S had a way to create labels that could
>denote multiple ways in which a value
t;
> To: "Marc Girondot" , r-help@r-project.org
> Sent: Tuesday, 21 December, 2021 10:26:12
> Subject: Re: [R] Creating NA equivalent
> On 20/12/2021 11:41 p.m., Marc Girondot via R-help wrote:
>> Dear members,
>>
>> I work about dosage and some v
On 20/12/2021 11:41 p.m., Marc Girondot via R-help wrote:
Dear members,
I work about dosage and some values are bellow the detection limit. I
would like create new "numbers" like LDL (to represent lower than
detection limit) and UDL (upper the detection limit) that behave like
NA, with the possi
Beyond known limits are left/right censored data. You need to use
statistical methodology that handles censoring. See the survival package
and the CRAN Survival task view for this -- or consult an appropriate
expert. There are of course standard ways of annotating such data in these
packages.
Bert
Dear members,
I work about dosage and some values are bellow the detection limit. I
would like create new "numbers" like LDL (to represent lower than
detection limit) and UDL (upper the detection limit) that behave like
NA, with the possibility to test them using for example is.LDL() or
is.UD
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