Blog Archives

Age & Growth with R (Portland, Oregon)

April 19, 2015
By
Age & Growth with R (Portland, Oregon)

I (and Northland alum Taylor Stewart) will be leading a continuing education course on using R for typical age and growth analyses as part of the national American Fisheries Society conference in Portland, OR.  Here is the announcement on the conference webpage … Continue reading →

Read more »

New Packages for Reading Data into R

April 15, 2015
By
New Packages for Reading Data into R

Hadley Wicham has announced two new package for reading external data into R that will likely be of great interest to fisheries scientists. readr — Several new functions that replace the traditional read.csv() and read.table() (among others).  Hadley’s announcement is here, … Continue reading →

Read more »

Recruitment Chapter for IFAR

April 2, 2015
By
Recruitment Chapter for IFAR

I have added a very rough draft of the Recruitment chapter to the Introduction to Fisheries Analysis with R (IFAR) page.  This chapter is a complete re-working of the old Stock-Recruitment vignette and includes a section on fitting non-linear stock-recruitment … Continue reading →

Read more »

Changes to Von B Growth Modeling in FSA

March 17, 2015
By
Changes to Von B Growth Modeling in FSA

In previous versions of FSA, growthModelSim() was used to produce a scatterplot of length-age data with a von Bertalanffy model superimposed where the parameters of the model were linked to slider bars that allowed the model to be dynamically changed … Continue reading →

Read more »

Mortality & Age Comparisons Chapters

March 13, 2015
By
Mortality & Age Comparisons Chapters

Thanks to some very thoughtful reviews, I have dramatically updated the Mortality and Age Comparisons chapters in the Introduction to Fisheries Analysis with R book. Changes to the Age Comparisons chapter in particular resulted in major changes to the FSA … Continue reading →

Read more »

Weight-Length & Condition Chapters Updated

March 7, 2015
By
Weight-Length & Condition Chapters Updated

Thanks to a couple of great reviews, I have updated the Weight-Length and Condition chapters of the forthcoming Introduction to Fisheries Analysis with R book. The suggestions resulted in some changes to the FSA package so you may want to … Continue reading →

Read more »

Data Wrangling Webinar and IFAR Chapter Update

January 22, 2015
By
Data Wrangling Webinar and IFAR Chapter Update

A week or so ago I participated in the “Data Wrangling” webinar provided by RStudio.  I found Garret Gromelund’s descriptions of the functions in tidyr and dplyr to be fantastic.  A recording of the webinar is available here on the RStudio … Continue reading →

Read more »

Plotting Fundamentals Chapter

December 24, 2014
By
Plotting Fundamentals Chapter

I have uploaded a draft of Chapter 3 — Plotting Fundamentals — for the Introduction to Fisheries Analyses with R (IFAR) book (note the new name).  This chapter is meant to be a quick introduction to plotting in base R for plots … Continue reading →

Read more »

Introduction to R Chapter for IFSWR Book

December 19, 2014
By
Introduction to R Chapter for IFSWR Book

I have uploaded a draft of Chapter 1 — A Very Brief Introduction to R — to Introduction to Fisheries Science with R book.  This chapter is very bare bones as there are many great introductions to R on the … Continue reading →

Read more »

Two New Cumulative Sum Functions

December 8, 2014
By
Two New Cumulative Sum Functions

In this document on RPubs, I describe two functions in FSA for computing cumulative sums.  The first is pcumsum() for computing the cumulative sum NOT including the current value and the second is rcumsum() for computing the “reverse” cumulative sum.Filed … Continue reading →

Read more »