3034 search results for "ggplot2"

Cross-validation of topic modelling

January 4, 2017
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Cross-validation of topic modelling

Determining the number of “topics” in a corpus of documents In my last post I finished by topic modelling a set of political blogs from 2004. I made a passing comment that it’s a challenge to know how many topics to set; the R topicmodels pack...

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Update jsonlite 1.2

January 4, 2017
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A new version of jsonlite package to CRAN. This is a maintenance release with enhancements and bug fixes. A summary of changes in v1.2 from the NEWS file: Add read_json and write_json convenience wrappers, #161 Update modp_numtoa from upstream, fixes a rounding issue in #148. Ensure asJSON.POSIXt does not use sci notation for negative values, #155 Tweak num_to_char...

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Why R is the best data science language to learn today

January 3, 2017
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Why R is the best data science language to learn today

In last week’s blog, I explained why you should Master R (even if it may eventually become obsolete). I wrote that article to address people who claim mastering R is a bit of a waste of time (because it will eventually become obsolete). But when I suggested that R may eventually become obsolete, this seemed The post

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Using R to download high frequency trade data directly from Bovespa

January 3, 2017
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Using R to download high frequency trade data directly from Bovespa

Using package GetHFData - Recently, Bovespa, the Brazilian financial exchange company, allowed external access to its ftp site. In this address one can find several information regarding the Brazilian financial system, including d...

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Understanding mixture models and expectation-maximization (using baseball statistics)

January 2, 2017
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Understanding mixture models and expectation-maximization (using baseball statistics)

Previously in this series: Understanding the beta distribution Understanding empirical Bayes estimation Understanding credible intervals Understanding the Bayesian approach to false discovery rates Understanding Bayesian A/B testing Understanding beta binomial regression Understanding empirical Bayesian hierarchical modeling In this series on empirical Bayesian methods on baseball data, we’ve been...

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Distributional Semantics in R: Part 2 Entity Recognition w. {openNLP}

January 2, 2017
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Distributional Semantics in R: Part 2 Entity Recognition w. {openNLP}

The R code for this tutorial on Methods of Distributional Semantics in R is found in the respective GitHub repository. You will find .R, .Rmd, and .html files corresponding to each part of this tutorial (e.g. DistSemanticsBelgradeR-Part2.R, DistSemant...

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How to download and organize financial data from yahoo finance for several tickers

January 2, 2017
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How to download and organize financial data from yahoo finance for several tickers

Using package BatchGetSymbols - One of the great things of working in finance is that financial datasets are freely available from sources such as Google and Yahoo Finance. This is an excelent feature for building up to date conte...

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What is a Linear Trend, by the way?

January 1, 2017
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What is a Linear Trend, by the way?

I had a very stranger discussion on twitter (yes, another one), about regression curves. I think it started with a tweet based on some xkcd picture (just for fun, because it was New Year’s Day) “don’t trust linear regressions” https://t.co/exUCvyRd1G pic.twitter.com/O6rBJfkULa — Arthur Charpentier (@freakonometrics) 1 janvier 2017 There were comments on that picture, by econometricians, mainly about ‘significant’...

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convert graphic object to tree object using treeio

January 1, 2017
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convert graphic object to tree object using treeio

I have splitted ggtree to 2 packages, treeio and ggtree. Now ggtree is mainly focus on visualization and annotation, while treeio focus on parsing and exporting tree files. Here is a welcome message from treeio that you can convert ggtree output to tree object which can be exported as newick or nexus file if you want. Thanks to ggplot2, output...

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tidyquant: Bringing Quantitative Financial Analysis to the tidyverse

December 31, 2016
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tidyquant: Bringing Quantitative Financial Analysis to the tidyverse

My new package, tidyquant, is now available on CRAN. tidyquant integrates the best quantitative resources for collecting and analyzing quantitative data, xts, quantmod and TTR, with the tidy data infrastructure of the tidyverse allowing for seamless in...

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