Mike Chelen (amiigo)'s Public Profile in the Diigo Community

I use Diigo because highlighting and commenting features

Member since Apr 14, 2008, follows 7 people, 39 public groups, 1765 public bookmarks (1854 total).

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Recent Tags:	open(0), source(0), science(0), ubuntu(0), google(0), linux(0), data(0), ec2(0), wiki(0), elearning(0), java(0), okfn(0), visualization(0), aws(0), ami(0), blog(0), twitter(0), web2.0(0)
Top Tags:	open(280), source(162), linux(127), science(113), wiki(104), google(89), data(88), distribute(76), drupal(72), ubuntu(71)

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Recent Bookmarks and Annotations

Raiden's Realm: Tutorial: Start screen and automatically run a command on 2009-11-05
- screen -d -m -S LinuxMint btdownloadheadless.py mint.torrent
Economics focus: E pluribus tunum | The Economist on 2009-10-30
- bought something for less than they were willing to pay
- difference between the price paid and the most a buyer would have agreed to
- 33 more annotations...
- - consumer surplus
  - the part of the overall economic benefit from any trade that the buyer gets
  - rest of the surplus from a trade goes to the seller
  - merchant wants to sell to each customer at a price as close as possible to the most that client would be willing to pay
  - this is impossible if everyone is charged the same price
  - tailor prices to people’s willingness to pay or price-sensitivity
  - vendors in street markets do when they offer naive tourists a higher price than seasoned locals
  - sellers can still encourage people to sort themselves into groups which can be charged different prices
  - Those who are particularly keen to get their hands on a copy of a new book, for instance, may be willing to pay a higher price for it
  - These tactics and others, like selling things in bundles rather than individually, all exploit differences in people’s sensitivity to price.
  - sellers and buyers would act under different pricing schemes
  - information about how those who buy music online value different songs
  - 500 undergraduate students at Wharton
  - 50 most popular songs on iTunes earlier that month
    Mike Chelen on 2009-10-30
    
    is this representative of the entire library?
  - Similar data were also collected in January this year, though this time some older and less popular tracks were also included
  - uniform price per song that maximised revenue among the students
  - $2.30 in 2008 and $1.46 in 2009
  - Wharton students may be particularly fond of music
    Mike Chelen on 2009-10-30
    
    age group may also be relatively fond of digital music, and socioeconomic class could have higher spending habits than average
  - song-specific pricing
  - increase profits by a mere 3%
  - people who valued one song highly also tended to place a high value on others
  - person-specific, rather than song-specific, pricing would be more efficient
  - sellers’ data are not refined enough to set different prices for different people
  - basic demographic information did not tell them much about musical tastes
  - according to the 2009 survey data, would be generated by charging the students $21.19 for entry and 37 cents a song
  - raise the producer surplus by 30%
  - Consumer surplus would also rise in this instance
  - buy songs they would have not have done at a higher uniform price
  - Spotify
  - monthly fee for songs without limit
  - several songs together in a bundle (much like an album)
  - For example, charging $16.95 for all 50 songs studied (which would have cost $49.50 to download) would leave profit unchanged because enough people would buy.
  - it would increase consumer surplus by around 50% by attracting new buyers
BBC NEWS | Technology | Government opens data to public on 2009-10-27
- "I would like to suggest: sure, make a beautiful website, but first, give us - all of us - the unadulterated data. We have to ask for raw data now."
Is there a way to batch recalculate all nodes? | drupal.org on 2009-10-16
- Views Bulk Operations
- node_save($object);
Slicehost Forum - ssh-add error: Could not open a connection to your authentication agent. on 2009-10-14
- exec ssh-agent bash
Howto: Use rtorrent like a pro « Motho ke motho ka botho on 2009-10-13
- screen rtorrent
- press Ctrl-a d and it will detach
- 1 more annotations...
- - screen -r
How To Specify A Custom php.ini For A Web Site (Apache2 With mod_php) | HowtoForge - Linux Howtos and Tutorials on 2009-10-08
- /etc/php5/apache2/php.ini
SQL Databases Don't Scale on 2009-10-07
- MySQL’s killer feature is easy configuration of master-slave replication, where you have a read-only slave database that replicates everything coming to the master database in realtime.
- sends any reads (SELECT) to one of the read slaves, while only sending writes (INSERT, UPDATE, DELETE) to the master
- 6 more annotations...
- - horizontal scaling on the read side
  - The read slave technique is the best option for scaling SQL databases.
  - transparent to the application
  - master server is a bottleneck
  - single point of failure
  - write-heavy applications
Generate SVG from XMLwith XSLT: Example on 2009-06-18
Data scraping with YQL and jQuery | kelvinluck.com on 2009-05-25
- need a list of all the US National Parks in XML format
- grab the data from this list on Wikipedia
- 10 more annotations...
- - navigating a HTML DOM
  - jQuery to parse the data
  - XPath to your YQL
  - relevant table from the Wikipedia document
  - SELECT * FROM html WHERE url="http://en.wikipedia.org/wiki/List_of_United_States_National_Parks_by_state" AND xpath="//table[@class='wikitable sortable']"
  - XML or JSON
  - creating an XML document
  - AJAX call from jQuery and then loop over the JSON
  - CSS style selection engine as well as the XPath one
    Mike Chelen on 2009-05-25
    
    added recently- http://developer.yahoo.net/blog/archives/2009/04/yql_execute.html
  - documentation could maybe be clearer

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Groups

Activism Resources

1 members, 2 items

Helpful resources and news for activism.
bioinformatics

14 members, 16 items
Classroom 2.0

1542 members, 4535 items

A place for members of www.Classroom20.com to share links, Classroom 2.0 is social networking site devoted to those interested in the practical application of computer technology (especially Web 2.0) in the classroom and in their own professional development.
Colbert Nation

2 members, 11 items
CSS Evangelist

383 members, 806 items

a collection of resources of all things CSS- Include how-tos, articles, resources, tools, etc...