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Using Displayr Adding a Combo Box to a Displayr Dashboard
22 August 2017 | by Tim Bock

A combo box can be added to a Displayr document by selecting Insert > Control (More), which causes a combo box to appear in the middle of the screen. The control allows the user to make one or…

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Choice Simulator How to Create an Online Choice Simulator
22 August 2017 | by Tim Bock

What is a choice simulator? A choice simulator is an online app or an Excel workbook that allows users to specify different scenarios and get predictions. Here is an example of a choice simulator. Choice simulators have…

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Supplementary Points: Aiding Interpretation of Correspondence Analysis
17 August 2017 | by Jake Hoare

Including supplementary row or column points to a correspondence analysis after the core data has determined the map can improve interpretation of the results. Correspondence analysis is a technique for analyzing tables of data, often used…

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Moonplot to show brand mapping from a correspondence analysis Correspondence Analysis Moonplots: A Better Visualization for Brand Maps
15 August 2017 | by Tim Bock

A Better Way to Visualize Brand Maps Correspondence analysis is the standard tool for creating brand maps. It shows which brands compete with which other brands and the basis for that competition. Unfortunately, correspondence analysis…

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Scaled world map showing longitude and latitude Normalization and the Scaling Problem in Correspondence Analysis
08 August 2017 | by Tim Bock

This post gives recommendations for the best approach to normalization for different situations, making correspondence plots less misleading.

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correspondence analysis example Understanding the Math of Correspondence Analysis with Examples in R
08 August 2017 | by Tim Bock

Correspondence analysis is a popular tool for visualizing the patterns in large tables. To many practitioners it is probably a black box. Table goes in, chart comes out. In this post I explain the mathematics…

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MaxDiff analysis example MaxDiff: 11 Tips to Do Your Own Analysis
03 August 2017 | by Tim Bock

MaxDiff analysis is one of those advanced techniques that can be run by any good quant researcher. Yes, the modern algorithms have their fair share of rocket science in them, but with a bit of…

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singular value decomposition Singular Value Decomposition (SVD): Tutorial Using Examples in R
02 August 2017 | by Tim Bock

If you have ever looked with any depth at statistical computing for multivariate analysis, there is a good chance you have come across the singular value decomposition (SVD). It is a workhorse for techniques that decompose data, such as correspondence analysis and principal…

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R-Squared 8 Tips for Interpreting R-Squared
31 July 2017 | by Tim Bock

Hopefully if you have landed on this post you have a basic idea of what the R-Squared statistic is. The R-Squared statistic is a number between 0 and 1, or, 0% and 100%, that quantifies…

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experimental design How to Check an Experimental Design (MaxDiff, Choice Modeling)
25 July 2017 | by Tim Bock

Every now and then somebody sends me an experimental design and says, “can you please check it for me, I need to know if it is OK, it is really urgent!”. Usually they also send…

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Correspondence Analysis for brand switching Correspondence Analysis of Brand Switching and Other Square Tables
25 July 2017 | by Jake Hoare

Correspondence analysis is a powerful technique that enables you to visualize a complex table of results as a much simpler chart. In this post I discuss the special case of square tables, which often arise in…

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preview Show information about the snippet editorYou can click on each element in the preview to jump to the Snippet Editor. SEO title preview: Displayr | Automatically Fitting the Support Vector Machine Cost Parameter
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Automatically Fitting the Support Vector Machine Cost Parameter
18 July 2017 | by Jake Hoare

In an earlier post I discussed how to avoid overfitting when using Support Vector Machines. This was achieved using cross validation. In cross validation, prediction accuracy is maximized by varying the cost parameter. Importantly, prediction accuracy is…

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