It Has Always Been Wrong to Call order on a data.frame
In R it has always been incorrect to call order() on a data.frame. Such a call doesn’t return a sort-order of the rows, and previously did not return an error. For example. d [Read more...]
February 2021
It Has Always Been Wrong to Call order on a data.frame
In R it has always been incorrect to call order() on a data.frame. Such a call doesn’t return a sort-order of the rows, and previously did not return an error. For example. d [Read more...]
Causal effect of Elon Musk tweets on Dogecoin price
If you think of Dogecoin — the cryptocurrency based on a meme — you can’t help but also think of Elon Musk. That guy loves the doge, and every time he tweets about it, the price goes up. While we all know that correlation is not causation, we might s... [Read more...]
Causal effect of Elon Musk tweets on Dogecoin price
If you think of Dogecoin — the cryptocurrency based on a meme — you can’t help but also think of Elon Musk. That guy loves the doge, and every time he tweets about it, the price goes up. While we all know that correlation is not causation, we might s...
GooglyPlusPlus2021 bubbles up top T20 players in all formats!
“Would you tell me, please, which way I ought to go from here?”“That depends a good deal on where you want to get to.”“I don’t much care where –”“Then it doesn’t matter which way you go.” Lewis Carroll, Alice in Wonderland This … Continue reading GooglyPlusPlus2021 bubbles ...
Analyzing SPAC Mergers
Exploratory data analysis of Special-Purpose Acquisition Companies as investment opportunities
The post Analyzing SPAC Mergers first appeared on Data Science Blog.
Converting Lists of Lists of Lists to Data.Frames (or Tibbles)
I’m working on an R-package to access the data of a web service.
So I have to handle large data I get back from an API call. The result is
encoded in JSON-format which itself results in a large list of lists (of lists).
But I want to convert ... [Read more...]
Fitting the Heckman selection model with Stan and R
Introduction
Selection bias
Selection bias occurs when sampled data or subjects in a study have been selected in a way that is not representative of the population of interest. As a consequence, conclusions made about the analyzed sample may be difficult to generalize, as the observed effects could be biased ...
era 0.3.1: year-based time scales in R
era v0.3.1 is now available on CRAN: [Read more...]
The Myths, Not So Myths, and Truths about Data Science
Background
Disclaimer
The Era of Data Science = Coding
The Era of Data Science = Research
The Era of Data Science = Ability to Write Algorithm from Scratch
A DS Project Starts from Data
A DS Project Ends with the Report/Predictions
Data Scientist ... [Read more...]
Cliping several rasters with a multi-polygon shapefile
The problem! Imagine you have this situation: you have several global raster files and a shapefile with a few areas (e.g. Natural Parks). You want to generate a raster file using as mask each of the polygons in the shapefile for each of the original rasters. So, if you ... [Read more...]
Python’s Pandas vs. R’s dplyr – Which Is The Best Data Analysis Library
Pandas vs. dplyr It’s difficult to find the ultimate go-to library for data analysis. Both R and Python provide excellent options, so the question quickly becomes “which data analysis library is the most convenient”. Today’s article aims to answer this question, assuming you’re equally skilled in both ...
From “Sh*t’s Creek” to “Schitt’s Creek”: On Padding Surnames with Extra Letters
We typically think of English and related spelling systems as mapping orthographic units or graphemes onto units of speech sounds, or phonemes. For instance, each of the three letters in “pen” maps to the three phonemes /p/, /ɛ/, and /n/ in the spoken version of the word. But there is considerable ... [Read more...]
Central Limit Theorem
The Central Limit Theorem (CLT) is an important theory in statistics. It basically says that you can use all statistical tools and methods that assume a normal distribution on a sample of the full population.…Continue Reading "Central Limit Theorem"
How to draw a map of arbitrary contiguous regions, or visualizing the spread of COVID-19 in the Greater Region
Introduction
I was able to blog during the year 2020 without mentioning the ongoing pandemic once. It’s not that I made
any conscious effort not to talk about it, but I did not really want to do something that had already
been done a 1000 tim... [Read more...]
Introducing wrapr::bc()
The wrapr R package supplies a number of substantial programming tools, including the S3/S4 compatible dot-pipe, unpack/pack object tools, and many more. It also supplies a number of formatting and parsing convenience tools: qc() (“quoting concatenate”): quotes strings, giving value-oriented interfaces much of the incidental convenience of non-standard ... [Read more...]
Introducing wrapr::bc()
The wrapr R package supplies a number of substantial programming tools, including the S3/S4 compatible dot-pipe, unpack/pack object tools, and many more. It also supplies a number of formatting and parsing convenience tools: qc() (“quoting concatenate”): quotes strings, giving value-oriented interfaces much of the incidental convenience of non-standard ... [Read more...]
Powerful dashboard frameworks for R shiny apps in 2021
In 2021, there are many package options for building pro-quality dashboards with your R shiny app. After a systematic review of our client work and exciting new options, here are my top three picks for building pro-quality R shiny app dashboards with five more excellent choices, depending on your project and ...
Lists are my secret weapon for reporting stats with knitr
I am going to describe my favorite knitr trick: Using lists to simplify inline reporting. Trick might not do it justice. I consider this a best practice for working with knitr.
Plug it in
Inline reporting lets you insert R expressions inside of
markd... [Read more...]
What is a sunflower plot?
A sunflower plot is a type of scatterplot which tries to reduce overplotting. When there are multiple points that have the same (x, y) values, sunflower plots plot just one point there, but has little edges (or “petals”) coming out … Continue reading →
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