[R] Estimating parameters of 3 parameters lognormal distribution

[Göran Broström]

On 01/17/2014 08:42 AM, Vito Ricci wrote:
> Hi Goran,
>
> thanks for your suggestion, but I believe it's not helpful for me...
>
> phreg statement "Proportional hazards model with parametric baseline
> hazard(s). Allows for stratification with dif-ferent scale and shape in
> each stratum, and left truncated and right censored data"
>
> I've data whose distribution is lognormal with three parameters, I need
> to fit this model and its 3 parameters, especially the the 3rd, the
> theresold.

Right; the "third parameter" in the extension of the lognormal (and 
loglogistic) distribution in phreg is a 'proportional hazards' 
parameter, i.e., multiplying the standard lognormal (loglogistic) hazard 
function by a constant. If you want a threshold parameter, it is not for 
you.

Göran


> Regards.
> VR
>
> Se non ora, quando?
> Se non qui, dove?
> Se non tu, chi?
>
>
> Il Venerdì 17 Gennaio 2014 8:26, Vito Ricci <vito_ricci at yahoo.com> ha
> scritto:
>
>     Many thanks for your suggestion.
>     Regards.
>     VR
>
>     Se non ora, quando?
>     Se non qui, dove?
>     Se non tu, chi?
>
>
>     Il Giovedì 16 Gennaio 2014 22:31, Göran Broström
>     <goran.brostrom at umu.se> ha scritto:
>
>         On 01/16/2014 04:59 PM, Vito Ricci wrote:
>          > Hi guys,
>          >
>          > is there in some R package a statement to fit parameters in a
>         3 parameters lognormal distribution.
>
>         Yes, the function 'phreg' in the package 'eha'.
>
>         Göran Broström
>
>
>
>          > Many thanks
>          > Vito Ricci
>
>          >     [[alternative HTML version deleted]]
>          >
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