[FLR-list] size

[Ernesto]

It won't work in several situations and IMO trying to find a solution 
for all doesn't work. We need to find a solution that works and 
implement methods for the others. We may try to be consistent with "age" 
and use [10,11) represented by "10" in the length names.

Best

EJ

On 05/22/2013 02:43 PM, Laurie Kell wrote:
> 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 
> <mailto: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
>>     <mailto: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
>>             <http://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
>>         <mailto: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 <tel:%2B39%200332%20785311>
>>         Fax: +39 0332 789658 <tel:%2B39%200332%20789658>
>>         https://fishreg.jrc.ec.europa.eu/
>>
>>
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>>
>>
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>
>
>     -- 
>     Ernesto Jardim<ernesto.jardim at jrc.ec.europa.eu>  <mailto: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  <tel:%2B39%200332%20785311>
>     Fax:+39 0332 789658  <tel:%2B39%200332%20789658>
>     https://fishreg.jrc.ec.europa.eu/
>
>
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-- 
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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