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…

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…

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…

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…

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

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…

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…

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…

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…

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…

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…

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…