FrequencyTable: Generate a Frequency Distribution Table for Fish Length Data

In aLBI: Estimating Length-Based Indicators for Fish Stock

Generate a Frequency Distribution Table for Fish Length Data

Description

This function creates a frequency distribution table for fish length data, using either a custom bin width or Wang's formula to calculate the ideal bin width. If the calculated bin width is a fraction, it is rounded to the nearest integer.

Arguments

data	A numeric vector or data frame containing fish length measurements. If a data frame is provided, the first numeric column will be selected.
bin_width	(Optional) A numeric value specifying the bin width for class intervals. If not provided, the bin width is automatically calculated using Wang's formula.
Lmax	(Optional) The maximum observed length of fish. Required only if the maximum length is not provided and bin width is calculated using Wang's formula.

Value

A list containing two data frames:

lfqTable	A frequency table with the length range and frequency.
lfreq	A table with the upper limits of bins and their frequencies.

Examples

# Generate random fish length data
set.seed(123)
fish_lengths <- data.frame(Length = runif(2000, min = 5, max = 70))

# Create a frequency table using Wang's formula (default)
FrequencyTable(data = fish_lengths$Length)

# Create a frequency table with a custom bin width
FrequencyTable(data = fish_lengths$Length, bin_width = 5)

aLBI documentation built on April 12, 2025, 2:01 a.m.