Using Excel to do precision journalism, an Update from the School of Data Journalism in Perugia. Our first workshop has just kicked off with Steve Doig leading “Excel for Journalists”. If you missed it, don’t worry – here’s the breakdown for you! Download the Data and the Tutorial You can download the full data for this tutorial and a text version of the tutorial itself via Steve’s website. The Tutorial A tutorial by Steve Doig, journalism professor at ASU's Cronkite School and Pulitzer-winning data journalist, based on his workshop, Excel for Journalists. Microsoft Excel is a powerful tool that will handle most tasks that are useful for a journalist who needs to analyze data to discover interesting patterns. Sorting Filtering Using math and text functions Pivot tables Introduction to Excel Excel will handle large amounts of data that is organized in table form, with rows and columns. Modern versions of Excel will hold as many as 1,048,576 records with as many as 16,384 variables! Sorting One of the most useful abilities of Excel is to sort the data into a more revealing order. Filtering
www.pelulamu.net/binmyst/ Title: The Mystery of the Binary Author: Viznut Originally published in the [ALT] magazine issue 0x0000 The subcultures of computing are very young. There are no legends nor values that come from the distant past. No ancient mysticism, no generations-old symbols that have deep emotional effects. Stone-age binary counting We are so completely surrounded by decimal numbers that most people believe humans were "built" to count in base ten: "we have ten fingers, you know." Divine binary protocols The human mind has a strange relationship with randomness. The Two Symbols There's a great deal of similarity between the African and Chinese notations for binary combinations: both use vertical piles where a single bit is designated by one or two "somethings", such as sticks, stones or seeds. The Eight Trigrams This figure shows the eight trigrams (the three-bit numbers) in the millennia-old Chinese Xiantian arrangement. The Sixteen Tetragrams The 64 Hexagrams The 256 Octagrams References
Complexity Explorer Mining of Massive Datasets The book has now been published by Cambridge University Press. The publisher is offering a 20% discount to anyone who buys the hardcopy Here. By agreement with the publisher, you can still download it free from this page. --- Jure Leskovec, Anand Rajaraman (@anand_raj), and Jeff Ullman Download Version 2.1 The following is the second edition of the book, which we expect to be published soon. There is a revised Chapter 2 that treats map-reduce programming in a manner closer to how it is used in practice, rather than how it was described in the original paper. Version 2.1 adds Section 10.5 on finding overlapping communities in social graphs. Download the Latest Book (511 pages, approximately 3MB) Download chapters of the book: Download Version 1.0 The following materials are equivalent to the published book, with errata corrected to July 4, 2012. Download the Book as Published (340 pages, approximately 2MB) Gradiance Support Other Stuff Jure's Materials from the most recent CS246.
66 job interview questions for data scientists We are now at 91 questions. We've also added 50 new ones here, and started to provide answers to these questions here. These are mostly open-ended questions, to assess the technical horizontal knowledge of a senior candidate for a rather high level position, e.g. director. What is the biggest data set that you processed, and how did you process it, what were the results? Related articles: Previous digest | Recent jobs | Top Links | Data Science eBook
Scraping websites using the Scraper extension for Chrome If you are using Google Chrome there is a browser extension for scraping web pages. It’s called “Scraper” and it is easy to use. It will help you scrape a website’s content and upload the results to google docs. Walkthrough: Scraping a website with the Scraper extension Open Google Chrome and click on Chrome Web StoreSearch for “Scraper” in extensionsThe first search result is the “Scraper” extensionClick the add to chrome button.Now let’s go back to the listing of UK MPsOpen mark the entry for one MP Right click and select “scrape similar…” A new window will appear – the scraper console In the scraper console you will see the scraped contentClick on “Save to Google Docs…” to save the scraped content as a Google Spreadsheet. Walkthrough: extended scraping with the Scraper extension Note: Before beginning this recipe – you may find it useful to understand a bit about HTML. Easy wasn’t it?
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