Data Visualization book is now on Kindle MatchBook!

Hey everyone! Do you like the convenience of having resource books on your tablet and also in hardback? Now you can get the best of both worlds! Check this out:

If you buy a new print edition of Data Visualization for Oracle Business Intelligence 11g (or purchased one in the past), you can buy the Kindle edition for only $2.99 (Save 91%). Print edition purchase must be sold by Amazon.
So go to the Amazon website and pick up both versions of the book today! 



Vlamis Software at Collaborate 2015 in April 2015

This year at Collaborate 2015 in Las Vegas, we have three members of the Vlamis team facilitating presentations. We hope to see you there!
For more information (including the abstracts) on these presentations, please see our Papers and Presentations page.


Perception of Colors of Dresses and Data Visualization

Finally, people are talking about color perception! Everybody is talking about the white/gold/blue/black dress that has gone viral as people discover that color perception is not absolute.

We cover this in our recent Oracle Press book on Data Visualization for Oracle Business 11g. From page 273: ‘We the authors often show a handful of optical illusions involving color perception/misperception during our data visualization workshops to drive home the point that we humans don’t see color as much as we “experience” it as our brains attempt to construct a color model for a given situation.’ In our presentation from BIWA Summit 2015 we showed a color spiral image.

Most people we talk to see a green and a blue spiral. In our presentations, we use a moving circle to demonstrate that these colors are actually the same value: RGB 0,255,151. Cick on the thumbnail of the spiral and take a print screen and use the eye dropper tool in Paint if you don’t believe me! Our brains perceive the colors differently because of the adjacency of other colors.

This becomes very important in constructing business intelligence dashboards. Color selection on dashboards affect how we perceive the data and the business insights obtained in ways we don’t even recognize. For sequential data, use sequential color schemes (e.g. increasing shades of blue for color-coding states based on increasing Revenue amount); for qualitative data use qualitative color schemes (e.g. various pastel colors of equal darkness to represent various brands).

For more information on the book that brother Tim Vlamis and I published in 2015, see our web page at


Omaha BI / DW User Group Meeting

Please join us at the Omana BI / DW User Group Meeting on Thursday, March 12th, 4 - 6:30pm at UNO's Mammel Hall.


Oracle Data Mining and Oracle R Enterprise Training

We are pleased to announce that Tim Vlamis will be facilitating a Live Virtual Class in Oracle Data Mining and Oracle R Enterprise.

  • Oracle Database 11g: Data Mining Techniques Ed 1 LVC - May 26 & 27, 2015
  • Oracle R Enterprise Essentials Ed 1 LVC - May 27 & 28, 2015

For more information, click here.