EconStor >
Stockholm School of Economics >
EFI - The Economic Research Institute, Stockholm School of Economics >
SSE/EFI Working Paper Series in Economics and Finance, EFI - The Economic Research Institute, Stockholm School of Economics >

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10419/56214
  
Title:Optimal categorization PDF Logo
Authors:Mohlin, Erik
Issue Date:2009
Series/Report no.:SSE/EFI Working Paper Series in Economics and Finance 721
Abstract:The importance of categorical reasoning in human cognition is well-established in psychology and cognitive science, and it is generally acknowledged that one of the most important functions of categorization is to facilitate prediction. This paper provides a model of optimal categorization. In the beginning of each period a subject observes a two-dimensional object in one dimension and wants to predict the object's value in the other dimension. The subject partitions the space of objects into categories. She has a data base of objects that were observed in both dimensions in the past. The subject determines what category the new object belongs to on the basis of observation of its first dimension. The average value in the second dimension, of objects in this category in the data base, is used as prediction for the object at hand. At the end of each period the second dimension is observed and the observation is stored in the data base. The main result is that the optimal number of categories is determined by a trade-off between (a) decreasing the size of categories in order to enhance category homogeneity, and (b) increasing the size of categories in order to enhance category sample size.
Subjects:Categorization
Priors
Prediction
Similarity-Based Reasoning
JEL:C72
Document Type:Working Paper
Appears in Collections:SSE/EFI Working Paper Series in Economics and Finance, EFI - The Economic Research Institute, Stockholm School of Economics

Files in This Item:
File Description SizeFormat
601469739.pdf327.52 kBAdobe PDF
No. of Downloads: Counter Stats
Download bibliographical data as: BibTeX
Share on:http://hdl.handle.net/10419/56214

Items in EconStor are protected by copyright, with all rights reserved, unless otherwise indicated.