multipliers by strata

[PABLO PALENCIA MAYORDOMO]

Hi folks,

I'm analysing and stratified distance survey, and I'm interested in including a strata-specific multiplier. However, I don't know how to handle 'dht2' function for that. Concretely, I'm considering 4 different stratas. 

If I run this, I'm considering a global multiplier for all the strata:

mult <- list(decay = data.frame(rate=c(0.41), SE=c(0.07)))

res_dens <- dht2(model_select, flatfile=dat, strat_formula = ~Region.Label, 

                 er_est = "P2", convert_units = conversion, stratification="geographical",

                 multipliers = mult)

I've tried with this:

mult <- list(decay = data.frame(rate=c(0.41, 0.47, 0.47, 0.36), SE=c(0.07, 0.06, 0.07, 0.08)))

 

and also by creating 4 different 'mult' objects, and later: multipliers =c(mult1, mult2, mult3, mult4)

but nothing works... 

It is possible to define a specific multiplier to each strata on 'dht2' function? Or I should include that on the 'Effort' column of my data frame?

Thank you very much for your help :)

Pablo

[Eric Rexstad]

Pablo

Unfortunately, the ability to specify stratum-specific multipliers is not yet implemented in `dht2`.  If you are using multipliers to compensate for viewable area as you discussed in your earlier question, then you could incorporate that compensation into your Effort measures.

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Eric Rexstad
Centre for Ecological and Environmental Modelling
University of St Andrews
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[PABLO PALENCIA MAYORDOMO]

Yes, that is. Thank you very much for your response!