spay-class: Class "spay" for standardised proportion at age per year
In FLEDA: Exploratory Data Analysis for FLR

Description Creating Objects from the Class Slots Extends Methods Details See Also Examples

This class encapsulates results of a spay method.

Objects of this classe should be created with a call to the contructor function spay(object, ...), where object must be an object of class "FLQuant" and ... can be used to pass trim arguments to the creator funtion.

spay: Object of class "FLQuant".

Class "FLQuant", directly.

Inherits from "FLQuant".

bubbles: signature(x="formula", data="spay"): provides the bubbles plot with different colors for positive and negative values.

Considering C_{ay}, the catch in numbers at age a=1,…,A per year y=1,…,Y, obtained e.g. from the catch.n slot of a "FLStock" object, the computation of spay P_{ay}^s is:

Consider:

P_{ay}=\frac{C_{ay}}{∑_a{C_{ay}}}

and

s_a = √{\frac{∑{(P_{ay}-\bar{P}_a)^2}}{Y-1}}

P_{ay}^s=\frac{P_{ay}-\bar{P}_a}{s_a}

FLQuant-class, trim, pay-class

data(ple4sex)
# compute standardized catch proportion at age
ple4sex.spay <- spay(ple4sex@catch.n)
# fine tune 
ttl <- list(label="Standardized catch proportion at age for Plaice in IV", cex=1)
yttl <- list(label="age", cex=0.8)
xttl <- list(cex=0.8)
ax <- list(cex=0.7)
# plot
bubbles(age~year|unit, ple4sex.spay,  main=ttl, 
        ylab=yttl, xlab=xttl, scales=ax)