March 2020

Mean expectations

March 27, 2020 | R on OSM

We’re taking a break from our extended analysis of rebalancing to get back to the other salient parts of portfolio construction. We haven’t given up on the deep dive into the merits or drawbacks of rebalancing, but we feel we need to move the discus...
[Read more...]

Nonlinear Modelling using nls, nlme and brms

March 27, 2020 | R on Residuals for Breakfast

Background The Application, the Model and the Data Application Model Data Fitting using nonlinear least squares (NLS) Fitting a single curve Fitting all the cuves Fits NLS Summary Fitting using frequentist multilevel modelling (nlme) Fitting the model to everyone Fits NLME Summary Bayesian multilevel modelling using MCMC with brms Modelling ...
[Read more...]

Nonlinear Modelling using nls, nlme and brms

March 27, 2020 | R on Residuals for Breakfast

Background The Application, the Model and the Data Application Model Data Fitting using nonlinear least squares (NLS) with the nls.multstart package Fitting a single curve Fitting all the cuves Fits NLS Summary Fitting using frequentist multilevel modelling (nlme) Fitting the model to everyone Fits NLME Summary Bayesian multilevel modelling ...
[Read more...]

a global pandemic on Twitter

March 27, 2020 | Jason Timm

Brief introduction Twitter details 2019 NOVEL CORONAVIRUS & lexical variation Patterns of variation over time Summary Brief introduction So, lots of linguistic variation happening in real time. coronavirus, covid19, pandemic, and more recently (the?) coronavirus pandemic. For sure, these expressions are not proper synonyms – each refer to different “aspects” of the virus. ...
[Read more...]

Mean expectations

March 27, 2020 | R on OSM

We’re taking a break from our extended analysis of rebalancing to get back to the other salient parts of portfolio construction. We haven’t given up on the deep dive into the merits or drawbacks of rebalancing, but we feel we need to move the discussion along to keep ...
[Read more...]

Le Monde puzzle [#1133]

March 27, 2020 | xi'an

A weekly Monde current mathematical puzzle that reminded me of an earlier one (but was too lazy to check): If ADULE-ELUDE=POINT, was is the largest possible value of POINT? With the convention that all letters correspond to different digits and no digit can start with 0. Same question when ADULE+...
[Read more...]

E-Learning Quizzes with R/exams for Moodle and OpenOLAT

March 27, 2020 | R/exams

Step-by-step tutorials for generating, importing, and customizing online tests and quizzes using exams2moodle() and exams2openolat() in R/exams. Motivation E-learning resources such as online tests and quizzes or more formal e-exams are very useful in a variety of settings: formative vs. summative assessments; in-class vs. distance learning; synchronous ... [Read more...]

Simulating your Model Training for Robust ML Models

March 27, 2020 | Nagdev

In this post, I will explain you why one should run simulations on their model training process so the models don’t fail in production. Traditionally we are always used to training models at certain split ratio’s of say, 70:30 or 80:20. The fundamental issue with this is that we don’...
[Read more...]

A COVID Small Multiple

March 27, 2020 | R on kieranhealy.org

John Burn-Murdoch has been doing very good work at the Financial Times producing various visualizations of the progress of COVID-19. One of his recent images is a small-multiple plot of cases by country, showing the trajectory of the outbreak for a large number of countries, with a the background of ... [Read more...]

COVID-19 Resource Gallery

March 27, 2020 | Mirai Solutions

We have gathered interesting COVID-19 resources and made them easily accessible within a single gallery website. The Data Science community is showing a great spirit of collaboration, extensively contributing to the understanding of the COVID-19 pan... [Read more...]

How to compute a semicovariance matrix with R

March 26, 2020 | mark geld

Most of you are probably familiar with the covariance matrix. Its less known brother, the semicovariance matrix, might however be new to you. The semicovariance matrix is pretty much like a covariance matrix, with the difference that it is computed acc... [Read more...]

How to compute a semicovariance matrix with R

March 26, 2020 | mark geld

Most of you are probably familiar with the covariance matrix. Its less known brother, the semicovariance matrix, might however be new to you. The semicovariance matrix is pretty much like a covariance matrix, with the difference that it is computed accounting only for the variability below a certain benchmark, which ... [Read more...]

Re-Share: vtreat Data Preparation Documentation and Video

March 26, 2020 | John Mount

I would like to re-share vtreat (R version, Python version) a data preparation documentation for machine learning tasks. vtreat is a system for preparing messy real world data for predictive modeling tasks (classification, regression, and so on). In particular it is very good at re-coding high-cardinality string-valued (or categorical) variables ... [Read more...]

Watercolors

March 26, 2020 | @aschinchon

Moça do corpo douradoDo Sol de IpanemaO seu balançadoÉ mais que um poema(Garota de Ipanema, João Gilberto) Sometimes I think about the reasons why I spend so many time doing experiments and writing my discoveries in a blog. Even although the main reason to start this ...
[Read more...]
1 2 3 4 5 … 14

Copyright © 2022 | MH Corporate basic by MH Themes

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)