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The t-test is one of the most often used in psychology and other social sciences. In APA format, researchers are told to report the means and standard deviations of both conditions; the t-statistic, its degrees of freedom, and its p-value; and an effect size with confidence interval (generally Cohen’s ... [Read more...]

# Libraries
packages <- 
  c("data.table",
    "stringr",
    "rlist",
    "tabulizer",
    "pdftools",
    "parallel",
    "DT"
    )

if (length(setdiff(packages,rownames(installed.packages()))) > 0) {
  install.packages(setdiff(packages, rownames(installed.packages())))  
}

invisible(lapply(packages, library, character.only = TRUE))

knitr::opts_chunk$set(comment=NA, fig.width=12, fig.height=8, out.width = '100%')

Introduction This post will be a continuation of Parsing of Mass Municipal PDF CAFR’s with Tabulizer, pdftools and AWS Textract - Part 1 dealing with extracting data from PDFs using R. When Redwall discovered pdftools, and its pdf_data() function, which maps out every word on a pdf page ... [Read more...]

At the end of March a paper modelling the impact of various scenarios on the spread of COVID-19 infections, by the MRC Centre for Global Infectious Disease Analysis at Imperial College, appears to have influenced the policy of the powers that be. This group recently started publishing their modelling code ... [Read more...]

At the end of March a paper modelling the impact of various scenarios on the spread of COVID-19 infections, by the MRC Centre for Global Infectious Disease Analysis at Imperial College, appears to have influenced the policy of the powers that be. This group recently started publishing their modelling code ... [Read more...]

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Possibly you have seen this graphic circulating on social media. At first it doesn’t look too remarkable, but then you notice the vertical axis. Oh. The gridlines are equally spaced on the page, but sometimes the same space represents 30 people, some... [Read more...]

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In my last post, I analysed how the level of education is affected by region, sex and year. In this post, I will continue with the same dataset but this time I will include age in the analysis. Please send suggestions for improvement of the analysis to [email protected]. ... [Read more...]

SR2 Chapter 3 Hard Posted on 5 April, 2020 by Brian Tags: statistical rethinking, solutions, grid approximation, posterior predictive check, posterior predictive distribution, map, binomial, hpdi Category: statistical-rethinking-2 Here’s my solutions to the hard exercises in chapter 3 of McElreath’s Statistical Rethinking, 2nd edition. \(\DeclareMathOperator{\dbinomial}{Binomial} \DeclareMathOperator{\dbernoulli}{Bernoulli} \DeclareMathOperator{\dpoisson}{... [Read more...]

SR2 Chapter 3 Medium Posted on 5 April, 2020 by Brian Tags: statistical rethinking, solutions, grid approximation, posterior probability, posterior predictive probability, hpdi, binomial Category: statistical-rethinking-2 Here’s my solution to the medium exercises in chapter 3 of McElreath’s Statistical Rethinking, 2nd edition. \(\DeclareMathOperator{\dbinomial}{Binomial} \DeclareMathOperator{\dbernoulli}{Bernoulli} \DeclareMathOperator{\dpoisson}{Poisson} \DeclareMathOperator{\... [Read more...]

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Developing the right mindset for learning statistics: Some suggestions [Read more...]

Introduction Caching intermediate objects in R can be an efficient way to avoid re-evaluating long-running computations. The general process is always the same: run the chunk of code once, store the output to disk, and load it up the next time the same chunk is run. There are, of course, ... [Read more...]

Introduction Caching intermediate objects in R can be an efficient way to avoid re-evaluating long-running computations. The general process is always the same: run the chunk of code once, store the output to disk, and load it up the next time the same chunk is run. There are, of course, ... [Read more...]

 Hi there,This is the best meme I've found during these days... Well, here it is my "BUT" contribution. Some weeks ago The Washington Post published this simulations about how "social distancing" could help to "flat the curve" of COVID-19 infections. I fell in love with these simulations because their ... [Read more...]

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