Publications by lortie
A quick primer on power
Cohen is power. Inferential statistics primarily invoke the following four key concepts: sample size, significance criterion, effect size, and statistical power. Cohen elegantly developed the maths, benchmarks, and key semantics associated with statistical power. Statistical power is the long-term probability of rejecting the null hypothesis (ty...
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A common sense review of @swcarpentry workshop by @RemiDaigle @juliesquid @ben_d_best @ecodatasci from @brenucsb @nceas
Rationale This Fall, I am teaching graduate-level biostatistics. I have not had the good fortune of teaching many graduate-level offerings, and I am really excited to do so. A team of top-notch big data scientists are hosted at NCEAS. They have recently formed a really exciting collaborative-learning collective entitled ecodatascience. I was also...
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#rstudio #github missing command lines for mac setup @rstudio @github @swcarpentry
Preamble Every few months, I try to do a clean install on my machine. I know that OS X Sierra is due out in September, but I elected to do a wipe and clean install now for the remainder of summer. Wipe, reinstall OSX from usb, brief minor hack/tweaks, then just a few apps including base-r and rstudio. I prefer to connect to github without deskto...
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A review of ‘R for Data Science’ book @hadleywickham #rstats #openscience
Data science Data science is a critical component of many domains of research including the domain I primarily function – ecology. However, in teaching biostatistics within the university context, we have typically focussed on the statistics and less on the science of data (i.e. handling, understanding, and manipulating data). This is unfortun...
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A set of #rstats #AdventureTime themed #openscience slide decks
Purpose I recently completed a set of data science for biostatistics training exercises for graduate students. I extensively used R for Data Science and Efficient R programming to develop a set of Adventure Time R-statistics slide decks. Whilst I recognize that they are very minimal in terms of text, I hope that the general visual flow can prov...
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Elements of a successful #openscience #rstats workshop
What makes an open science workshop effective or successful*? Over the last 15 years, I have had the good fortune to participate in workshops as a student and sometimes as an instructor. Consistently, there were beneficial discovery experiences, and at times, some of the processes highlighted have been transformative. Last year, I had the good f...
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Overdispersion tests in #rstats
A brief note on overdispersion Assumptions Poisson distribution assume variance is equal to the mean. Quasi-poisson model assumes variance is a linear function of mean. Negative binomial model assumes variance is a quadratic function of the mean. rstats implementation #to test you need to fit a poisson GLM then apply function to this model librar...
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A note on AIC scores for quasi-families in #rstats
A summary note on recent set of #rstats discoveries in estimating AIC scores to better understand a quasipoisson family in GLMS relative to treating data as poisson. Conceptual GLM workflow rules/guidelines Data are best untransformed. Fit better model to data. Select your data structure to match purpose with statistical model. Use logic and u...
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Overdispersion tests in #rstats
A brief note on overdispersion Assumptions Poisson distribution assume variance is equal to the mean. Quasi-poisson model assumes variance is a linear function of mean. Negative binomial model assumes variance is a quadratic function of the mean. rstats implementation #to test you need to fit a poisson GLM then apply function to this model librar...
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Hacking the principles of #openscience #workshops
In a previous post, I discussed the key elements that really stood out for me in recent workshops associated with open science, data science, and ecology. Summer workshop season is upon us, and here are some principles to consider that can be used to hack a workshop. These hacks can be applied a priori as an instructor or in situ as a participan...
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