Website of the Day – Slideshare

I came across an interesting site while reading [World’s Best Presentation Contest Winners Announced][1] by [Guy Kawasaki][2] called [SlideShare][3].

It’s a happy medium between the bulk of image sites like Flickr and Yahoo Photos and video sites like Revver and YouTube where you can easily add Text to what you are wanting to say in a Slide Show. Interestingly enough, like most Web 2.0 Communities people will come up with ideas you never considered, for example check out Evangeline Lilly where this is effectively a portfolio photo shoot of an actress. Clever.

Tagged with: Cool Tools Show Your Stuff Web Sites

Producing Alternative Means statistics with SQL

Producing Alternative Means statistics with SQL

MySQL’s built-in AVG() computes the arithmetic mean — the sum divided by the count. That is the right default for many questions, but it is not always the right measure of central tendency.

Extending MySQL Capabilities with UDFs, Plugins and Components

Extending MySQL Capabilities with UDFs, Plugins and Components

MySQL offers three different approaches to extending the SQL capabilities with the default product you download and install. These are: User Defined Function (UDF) MySQL Manual MySQL Plugin MySQL Manual MySQL Component MySQL Manual For the purposes of this post I will be using the current LTS version MySQL 8.

Producing One-Sample Z-Test statistics with SQL

Producing One-Sample Z-Test statistics with SQL

The one-sample Z-test determines whether a sample mean differs significantly from a known population mean when the population standard deviation is also known. It is the appropriate test when the population parameters are established — quality control benchmarks, national averages, long-run process measurements — and you want to evaluate whether a new sample is consistent with them.