Sunday, April 28, 2013
Friday, April 26, 2013
A new copy comes with a $267.44 price tag!!! Here is my review; slightly enhanced from the version I wrote on Amazon.
Monday, April 22, 2013
Percentile Rules of ThumbIn The Practical Performance Analyst (1998, 2000) and Analyzing Computer System Performance with Perl::PDQ (2011), I offer the following Guerrilla rules of thumb for percentiles, based on a mean residence time R:
- 80th percentile: p80 ≃ 5R/3
- 90th percentile: p90 ≃ 7R/3
- 95th percentile: p95 ≃ 9R/3
I could also add the 50th percentile or median: p50 ≃ 2R/3, which I hadn't thought of until I was putting this blog post together.
As usual, all classes are held at our lovely Larkspur Landing location. Before registering online, take a look at what former students have said about the Guerrilla courses.
Attendees should bring their laptops, as course materials are provided on CD or flash drive. Larkspur Landing also provides free Internet wi-fi in all rooms.
Thursday, April 18, 2013
Figure 1. Edwin Hubble's original scatterplot
It shows the recession velocity of the "stars" (in km/s) on the y-axis and their corresponding distance (in Megaparsecs) on the x-axis. A Megaparsec is about 3.25 million light-years. This scatterplot is important for several reasons:
Tuesday, April 9, 2013