[FLR-list] size

[Laurie Kell]

but wont work with age slicing which is based on > & <=.

Laurie


On Wed, May 22, 2013 at 2:41 PM, Ernesto <ernesto.jardim at jrc.ec.europa.eu>wrote:

>  Hi,
>
> Yes, that is a problem that we need to sort out. I'm considering using
> midpoints. It has the advantage of being easy to coerce into numeric. In
> most cases that's what one needs for computations. Using boundaries will
> require other(s) operation(s) to get midpoints.
>
> Best
>
> EJ
>
>
> On 05/22/2013 02:23 PM, Laurie Kell wrote:
>
>   There is an issue, boring but may be important to agree on now, i.e.
> labeling of length bins.
>
>  What does a length bin mean, i.e. if the "quant" dim represents length?
> and the values are 5, 10, ...?
>
>  In the mixdist package these are the righthand boundaries i.e. they
> represent (0,5] and (5,10]. But if they are the lefthand boundaries then
> they represent (5,10] and (10,INF]. Or they could be midpoints. One option
> would be to explicitly label the bins with the boundaries and then have
> methods for going backwards and forwards between parametric and
> non-parametric methods. Or to have an attribute that tracks the properties.
>
>  Otherwise I can see a lot of time being wasted in stock assessments.
> well more than normal.
>  Laurie
>
>
> On Wed, May 22, 2013 at 1:07 PM, Ernesto <ernesto.jardim at jrc.ec.europa.eu>wrote:
>
>> On 05/22/2013 12:02 PM, Ernesto wrote:
>>
>>> On 05/22/2013 11:34 AM, Sarah Kraak wrote:
>>>
>>>> Hi FLR-guys,
>>>>
>>>> As you know I am not an active FLR user, but last year I showed some
>>>> interest in whether you have size-based stuff in FLR (see attached email).
>>>> In the meanwhile Coilin Minto and myself have been working on something
>>>> (also attached - note this is a draft of the idea; at the moment we are
>>>> working on the code to get the final graphs out) which we are coding in R
>>>> but which could/should eventually been done in FLR. Perhaps you are
>>>> interested.
>>>>
>>>> Cheers,
>>>> Sarah
>>>>
>>>
>>> Hi,
>>>
>>> Following Laurie's suggestion I've started a git repository for length
>>> methods in FLRhttps://github.com/ejardim/FLMethLen
>>>
>>> Maybe our first task should be o write down what we're doing with length
>>> data. Laurie's working on ALKs, so I guess you're interested in
>>> converting length frequencies to ages for stock assessment !? We (a4a)
>>> are working on OMs and how to generate them from length based data so
>>> that uncertainty on the growth model can be included in the MSE. Sarah
>>> and Colin Minto are working on selectivity. What else ?
>>>
>>> Best
>>>
>>> EJ
>>>
>>  Hi,
>>
>> I've updated the readme to reflect the latest messages.
>>
>>
>> EJ
>>
>> --
>> Ernesto Jardim<ernesto.jardim at jrc.ec.europa.eu>
>> Fisheries Scientist
>> FISHREG – Scientific Support to Fisheries
>> IPSC Maritime Affairs Unit
>> EC Joint Research Center
>> TP 051, Via Enrico Fermi 2749
>> I-21027 Ispra (VA), Italy
>> Office : +39 0332 785311
>> Fax: +39 0332 789658
>> https://fishreg.jrc.ec.europa.eu/
>>
>>
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>
>
>
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>
> --
> Ernesto Jardim<ernesto.jardim at jrc.ec.europa.eu> <ernesto.jardim at jrc.ec.europa.eu>
> Fisheries Scientist
> FISHREG – Scientific Support to Fisheries
> IPSC Maritime Affairs Unit
> EC Joint Research Center
> TP 051, Via Enrico Fermi 2749
> I-21027 Ispra (VA), Italy
> Office : +39 0332 785311
> Fax: +39 0332 789658https://fishreg.jrc.ec.europa.eu/
>
>
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