[OGRUG] R-UG-Ottawa Digest, Vol 40, Issue 1

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Today's Topics:

   1. Centres of ExpeRtise within GOC? (Alex Demarsh)
   2. Likelihood Ratio Test (Felipe)
   3. Re: Centres of ExpeRtise within GOC? (clark richards)


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Message: 1
Date: Mon, 08 Aug 2016 18:05:48 +0000
From: Alex Demarsh <alexdemarsh at gmail.com>
To: r-ug-ottawa at r-project.org
Subject: [OGRUG] Centres of ExpeRtise within GOC?
Message-ID:
        <CAPJGrdfZ97DbUH8vXuUoO8Eb6UW=g_UpFuy=qir85Xw3qiCpOg at mail.
gmail.com>
Content-Type: text/plain; charset="UTF-8"

Hey folks -

Not sure if this is on-topic for this list, but I've become curious about
the prevalence of R use in the Government of Canada (GOC) - particularly
how many analytic teams are using R as their primary language.

So, if you're a member of (or just know of) such an "R Shop", could you let
me know? Any information on specific tasks or level of expertise would be a
helpful addition.

Many thanks in advance,

Alex Demarsh
Epidemiologist/Biostatistician, Public Health Agency of Canada

        [[alternative HTML version deleted]]



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Message: 2
Date: Mon, 8 Aug 2016 22:15:31 -0300
From: Felipe <felipe.e.barletta at gmail.com>
To: r-ug-ottawa at r-project.org
Subject: [OGRUG] Likelihood Ratio Test
Message-ID: <57A92EB3.90506 at gmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed

Hi dear R users!

I have a dubt about how to calculate the Likelihood Ratio Test:

I have below a density function:


##### Density Gompertz
dG <- function(x,a,b, log=FALSE){
d2 <- numeric(length(x))
d2 <- b*exp(a*x)*exp(-b/a*(exp(a*x) - 1))
dens <- if(log) log(d2) else d2
return (dens)
}

#### log-likelihood
ldG <- function(par, x)
{
sum( dG(x, a = par[1], b = par[2], log = TRUE))
}

emv.dG <- optim(par = c(.15, .01), fn = ldG, x = d1, hessian=TRUE
,control=list("fnscale"=-1))

emv.dG$value # likelihood

How do I calculate the Likelihood Ratio Test without a some package.
LRT = -2*(emv.dG$value - ?????)

--
Atenciosamente
Felipe E. Barletta Mendes
Estat?stico(UFPR) - Conre3 9766-A
Mestrando em Bioestat?stica(UEM)
+55 (41)-92077191
+55 (41)-33287216



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Message: 3
Date: Mon, 8 Aug 2016 22:09:22 -0400
From: clark richards <clark.richards at gmail.com>
To: Alex Demarsh <alexdemarsh at gmail.com>
Cc: r-ug-ottawa at r-project.org
Subject: Re: [OGRUG] Centres of ExpeRtise within GOC?
Message-ID:
        <CAJx09Ak8Ch_Hzf=FTk53U=Dj4QY7hwNb30sdwu3Euz_ufUdQrQ at mail.
gmail.com>
Content-Type: text/plain; charset="UTF-8"

Hi Alex,

Not sure if this is useful for you or not, but I'm a physical oceanographer
that uses R for data analysis. Maybe not the kind of analytics you're
referring to?

While I'm not currently a GOC employee, I will be in a few weeks after I
start a position as a research scientist at the Bedford Institute of
Oceanography (BIO) in Halifax (in the middle of packing boxes right now!).
I don't know of any specific "analytic teams" at BIO, but I do know that
they are migrating much of their in-house data processing and archiving
facilities from Matlab to R (and possibly some python). Physical
oceanography has been (and continues to be) mostly dominated by Matlab, but
I think that tide is turning, especially for government where the licenses
are getting harder to justify.

I am also the co-author of the R package `oce` which is aimed at
oceanographers who work with data. I don't know what the usage of oce is
like across the government, but I do think it's increasing across academia
generally, as more students come up through the system with some exposure
to R from their undergraduate degrees.

Cheers,
Clark

On Mon, Aug 8, 2016 at 2:05 PM, Alex Demarsh <alexdemarsh at gmail.com>
wrote:

Hey folks -

Not sure if this is on-topic for this list, but I've become curious about
the prevalence of R use in the Government of Canada (GOC) - particularly
how many analytic teams are using R as their primary language.

So, if you're a member of (or just know of) such an "R Shop", could you
let
me know? Any information on specific tasks or level of expertise would
be a
helpful addition.

Many thanks in advance,

Alex Demarsh
Epidemiologist/Biostatistician, Public Health Agency of Canada

        [[alternative HTML version deleted]]

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