spay-class: Class "spay" for standardised proportion at age per year

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

Description

This class encapsulates results of a spay method.

Creating Objects from the Class

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.

Slots

spay

Object of class "FLQuant".

Extends

Class "FLQuant", directly.

Methods

Inherits from "FLQuant".

bubbles

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

Details

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}

See Also

FLQuant-class, trim, pay-class

Examples

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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)

FLEDA documentation built on May 31, 2017, 3:35 a.m.