StrataFactors.fn: Strata factors by name

In nwfscSurveyCode: What the package does (short line)

Description

Creates a vector of strata factors by name

Usage

StrataFactors.fn(dat, strat.vars, strat.df)

Arguments

dat	A dataframe with column names corresponding to strat.vars
strat.vars	Character vector of the stratum variables. Typically 'BOTTOM_DEPTH' and 'START_LATITUDE'. See Details.
strat.df	A dataframe describing the strata name, area, and boundaries. Boundaries are determined by latitude and bottom depth. See Details.

Details

strat.df is a dataframe with a column called “name” and two columns for each stratum variable (START_LATITUDE and BOTTOM_DEPTH) indicating the low and high bounds. The columns for each stratum variable should be named with the stratum variable name followed by .1 for the low bound and .2 for the high bound. For example, this is what a strat.df would look like (as called in the example below). \beginverbatim name area START_LATITUDE.2 START_LATITUDE.1 BOTTOM_DEPTH.1 BOTTOM_DEPTH.2 A 5829 49.0 45.0 183 549 B 4024 49.0 45.0 549 900 C 9259 49.0 40.5 900 1280 D 6211 45.0 40.5 183 549 E 5264 45.0 40.5 549 900 F 6952 40.5 34.5 183 549 G 7801 40.5 34.5 549 900 H 8059 40.5 34.5 900 1280 \endverbatim You can use StratAreas.fn to calculate the area of the strata using the SA3 data. You will need to supply boundaries available in the SA3 file.

Value

A vector of stratum names as a factor

Author(s)

Allan Hicks

nwfscSurveyCode documentation built on May 2, 2019, 5:27 p.m.