Blog Upgrade Time Again

Well, in the space of a few months, I’ve outgrown the previous Drupal version I was using for Blogs, which was a replacement of an earlier Blog implementation. The primary reason was better date based indexing, either by months, or calendar functions. I was told that a calendar function was available but was unable to locate (at least easily).

Anyway, I’m now using WordPress. It provides the added strength of Archives (which is in months), and one other great thing – Categories. Given I’ve been writing across a few different technologies and interests it’s great to be able to seperate these out, and then even submit this appropiately via RSS to some blog aggregetors.

I’ve moved all my articles, but I’ve lost the dates of older stuff from my first move. The old blog is still available at http://techstuff.arabx.com.au

Tagged with: General

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.