Analytic Hierarchy Process (AHP)
Posted by Armando Brito Mendes | Filed under ADM - multicritério, Investigação Operacional, planeamento, SAD - DSS
Uma página no facebook sobre esta técnica de multicritério
• To disseminate knowledge and resources on Analytic Hierarchy Process (AHP) based Multi Criteria Decision Making (MCDM) technique • To create a forum for AHP users • To disseminate AHP related activities taking place globally • Helping people and institutions in making complex decisions •
Tags: decisao em grupo, decisão médica
How many statisticians does it take to split a bill?
Posted by Armando Brito Mendes | Filed under estatística, software
stas
Bom blogue, bem disposto aborda diferenças entre estatística e ML
Some thoughts on the Fall term, now that Spring is well under way [edit: added a few more points]:
- RMarkdown and knitr are amazing. When I next teach a course using R, my students will be turning in homeworks using these tools: The output immediately shows whether the code runs and what its results are. This is much better than students copying and pasting possibly-broken code and unconnected output into a text file or (gasp) Word document.
- I’m glad my cohort socializes outside the office, taking each other out for birthday lunches or going to see a Pirates game. Some of the older PhD students are so focused on their thesis work that they don’t take time for a social break, and I’d like to avoid getting stuck in that rut.
However! Our lunches always lead us back to the age old question: How many statisticians does it take to split a bill? Answer: too long. I threw together a Shiny app, DinneR, to help us answer this question.
Tags: big data, data mining, R-software, software estatístico
Using Dates and Times in R
Posted by Armando Brito Mendes | Filed under estatística, software
Excelente sobre a utilização de tempos e datas no R
Today at the Davis R Users’ Group, Bonnie Dixon gave a tutorial on the various ways to handle dates and times in R. Bonnie provided this great script which walks through essential classes, functions, and packages. Here it is piped throughknitr::spin. The original R script can be found as a gist here.
Tags: data mining, R-software, software estatístico
Interactive maps with R
Posted by Armando Brito Mendes | Filed under software, visualização
Bibliotecas para construir mapas com alguma interação no R
You can make static maps in R relatively well, if you know what packages to use and what to look for, but there isn’t much direct interaction with your graphics. rMaps is a package that helps you create maps that you can mouse over and zoom in to.
Don’t get too excited though. A scan of the docs shows that it’s basically a wrapper around JavaScript libraries Leaflet, DataMaps and Crosslet, so you could learn those directly instead, and you’d be better for it in the long run if you plan to make more maps. But if you’re just working on a one-off or must stay in R because your life depends on, rMaps might be an option.
Tags: data mining, desnvolvimento de software, mapas, R-software
A fábrica de Lego e o Lean Six Sigma
Posted by Armando Brito Mendes | Filed under materiais ensino, planeamento, videos
Uma animação com exemplo de aplicação do lean six sigma
Neste vídeo, uma fábrica de Lego cuja situação era de caos e desastre torna-se um exemplo de gestão, após a aplicação dos conceitos de Lean Six Sigma.
Tags: análise de sistemas, definição, gestão de projetos, modelos empresariais
The Dangers of Bling Data Visualizations
Posted by Armando Brito Mendes | Filed under estatística, visualização
Excelente de descrição de erros em visualização
The Dangers of Bling Data Visualizations
Given the volume of information that’s pouring into the enterprise from so many disparate sources, knowledge workers need to be able to visualize information in order to analyze it and extrapolate insights effectively.
When business users can visualize information, they’re able to process it more effectively and make faster and better decisions, according to Aberdeen research. Business users are constantly seeking the best ways to understand the data behind the data. If a monthly sales figure is low, what are the reasons the sales team is underperforming? The most effective way to help business users understand the data behind the data is by making it visual for them.
Data visualization has recently made its way into the mainstream by the way of infographics, business intelligence dashboards and, in some cases, statistical graphics. However, today data visualization comes in many forms and more often than not there might be too much “bling” incorporated into these data representations, leaving an audience with nothing more than a pretty picture. In this article, we contrast some good and bad examples of visualizations via examination of the salient features of the graphical displays. We will also demonstrate how poorly designed visualizations can lead to erroneous decisions.
Tags: big data, data mining, Estat Descritiva
Learn R interactively with the swirl package
Posted by Armando Brito Mendes | Filed under estatística, materiais ensino, software
Um pacote R para construir lições interativas
swirl is a software package for the R statistical programming language. Its purpose is to teach users statistics and R simultaneously and interactively.
Tags: data mining, desnvolvimento de software, R-software, software estatístico
How R came to be
Posted by Armando Brito Mendes | Filed under estatística, software, videos
Uma entrevista sobre como surgiu o R
How R came to be
Statistician John Chambers, the creator of S and a core member of R, talks about how R came to be in the short video below. Warning: Super nerdy waters ahead.
Tags: desnvolvimento de software, R-software, software estatístico
History through the president’s words
Posted by Armando Brito Mendes | Filed under visualização
Uma excelente visualização baseada em Text Mining
History through the president’s words
By Kennedy Elliott, Richard Johnson and Ted Mellnik, Published: Jan. 28, 2014
Since 1900, there have been 116 State of the Union addresses, given by 20 presidents, with some presidents giving two addresses a year. Studying their choice of words, over time, provides glimpses of change in American politics—“communism” fades, “terrorism” increases—and evidence that some things never change (“America” comes up steadily, of course. As does “I.”). Wayne Fields, a professor of English and American Culture Studies at Washington University in St. Louis, and Mark Liberman, a linguist at the University of Pennsylvania, offered their analysis of the meaning behind the words the presidents used.
Download graphic
Tags: belo, data mining, text mining
Como otimizar um processo de negócio
Posted by Armando Brito Mendes | Filed under Investigação Operacional, software
Business Process Management (BPM) explicado por um consultor
Neste artigo apresentarei uma técnica prática e eficaz para o aprimoramento dos processos corporativos, o mapeamento de processos. Esta técnica é apenas a ponta do iceberg de um tema muito mais abrangente denominado Business Process Management (BPM), ou Gestão por Processos de Negócio. Explicarei brevemente a metodologia de BPM, seus benefícios e ferramentas, mas o foco de nossa conversa é o primeiro passo desta metodologia o MAPEAMENTO DE PROCESSOS.
Tags: análise de sistemas, definição, modelos empresariais, qualidade
