I am a tech lead and senior software developer. I write articles on data science, programming and online industry. • Reach me at rafalrybnik@yahoo.com

Efficient use of renewable energy sources with machine learning

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Unless stated otherwise, all pictures in the article are by the author.


Online visualisation of spreadsheet data

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Unless stated otherwise, all pictures in the article are by the author.


Make data your unfair competitive advantage

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Conjoint analysis is based on the idea the relative attributes and their levels considered jointly can be measured better than when considered in isolation. (fig. by author)


Last proposition of Web Neural Network API for better web performance

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(fig. source)

Neural hardware


Using Python and Meteoblue weather newsletter

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Meteogram for the period from 12 December to 6 January. (data by Meteoblue, animated by author)
  • Temperature chart with weather pictograms. The time from sunrise to sunset is indicated in light yellow.
  • Clouds in different altitudes: from a few clouds (light grey) to overcast (dark grey). Dark blue bars show hourly precipitation and light blue showers. An asterisk indicates snowfall.
  • Forecasts for wind speeds are blue and for gusts are green. …


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Unless stated otherwise, all pictures in the article are by the author.

How to choose evaluation statistics


Spreadsheet as a database for web application

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All pictures in the article are by the author.


Choice-Based Conjoint Analysis

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In choice-based conjoint analysis, a set of products is presented to consumers in a similar manner to the real marketplace situation. They decide which one is the most attractive for them. (fig. by author)


Advice from Google’s chief economist

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Hal R. Varian, Google’s Chief Economist (pic. source)


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Windows hourglass cursor (source)
Example of spinner (by author)
pip install yaspin

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