Blog Archives

New blog site: From Jekyll to Hugo

November 2, 2018
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I while ago I wrote about purchasing my own webserver in digital ocean and hosting my shinny applications. Last week I finally got some time to migrate my blog from Github to my new domain, www.msperlin.com. While doing that, I also decided to change t...

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Some Useful Tricks in RStudio

November 2, 2018
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Some Useful Tricks in RStudio

I’ve been using Rstudio for a long time and I got some tricks to share. These are simple and useful commands and shortcuts that really help the productivity of my students. If you got a suggestion of trick, use the comment section and I’ll add it in this post. Package rstudioapi When using Rstudio, package rstudioapi gives you lots of information...

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Loops and Pizzas

October 18, 2018
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Loops in R First, if you are new to programming, you should know that loops are a way to tell the computer that you want to repeat some operation for a number of times. This is a very common task that can be found in many programming languages. For example, let’s say you invited five friends for dinner at your...

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New package in CRAN: PkgsFromFiles

October 12, 2018
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New package in CRAN: PkgsFromFiles

Its been a while since I develop a CRAN package and this weekend I decided to work on a idea I had some time ago. The result is package PkgsFromFiles. When working with different computers at home or work, one of the problems I have is installing missing packages across different computers. As an example, a script that works in...

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Update to GetLattesData

October 10, 2018
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Update to GetLattesData

Last year I released GetLattesData. This package is very handy for anyone that researches bibliometric data of Brazilian scholars. You could easily import the whole academic history of any researcher registered at the platform. More details about Lattes and GetLattesData in the this post. However, a couple months ago CNPQ introduced a captcha in the webpage. This made it impossible...

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BatchGetSymbols 2.2

October 9, 2018
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BatchGetSymbols 2.2

One of the main requests I get for package BatchGetSymbols is to add the choice of frequency of the financial dataset. Today I finally got some time to work on it. I just posted a new version of BatchGetSymbols in CRAN. The major change is that users can now set the time frequency of the financial data: dailly, weekly,...

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Benchmarking a SSD drive in reading and writing files with R

June 28, 2018
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Benchmarking a SSD drive in reading and writing files with R

I recently bought a new computer for home and it came with two drives, one HDD and other SSD. The later is used for the OS and the former stores all of my personal files. From all computers I had, both home and work, this is definitely the fastest. While some of the merits are due to the newer...

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Second Edition of “Processamento e Analise de Dados Financeiros e Econômicos com o R”

June 11, 2018
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It is with great pleasure that I announce the second edition of the portuguese version of my book, Processing and Analyzing Financial Data with R. This edition updates the material significantly. The portuguese version is now not only in par with the i...

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Investing for the Long Run

May 11, 2018
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Investing for the Long Run

I often get asked about how to invest in the stock market. Not surprisingly, this has been a common topic in my classes. Brazil is experiencing a big change in its financial scenario. Historically, fixed income instruments paid a large premium over the stock market and that is no longer the case. Interest rates are low, without the pressure...

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Predatory Journals and R

April 21, 2018
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My paper about the penetration of predatory journals in Brazil, Is predatory publishing a real threat? Evidence from a large database study, just got published in Scientometrics!. The working paper version is available in SSRN. This is a nice example o...

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