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Use of Constraints in the Hierarchical Aggregation Procedure IntramaxDrobne, Samo ; Lakner, MitjaBackground: Intramax is a hierarchical aggregation procedure for dealing with the multi-level specification problem and with the association issue of data set reduction, but it was used as a ... functional regionalization procedure many times in the past. Objectives: In this paper, we analyse the simultaneous use of three different constraints in the original Intramax procedure, i.e. the contiguity constraint, the higher-inner-flows constraint, and the lower-variation-of-inner-flows constraint. Methods/Approach: The inclusion of constraints in the Intramax procedure was analysed by a programme code developed in Mathematica 10.3 by the processing time, by intra-regional shares of total flows, by self-containment indexes, by numbers of singleton and isolated regions, by the number of aggregation steps where a combination of constraints was applied, by the number of searching steps until the combination of constraints was satisfied, and by surveying the results geographically. Results: The use of the contiguity constraint is important only at the beginning of the aggregation procedure; the higher-inner-flows constraint gives singleton regions, and the lower-variation constraint forces the biggest employment centre as an isolated region up to a relatively high level of aggregation. Conclusions: The original Intramax procedure (without the inclusion of any constraint) gives the most balanced and operative hierarchical sets of functional regions without any singletons or isolated regions.Source: Business systems research journal : international journal of the Society for Promotion of Business Information Technology (BIT). - ISSN 1847-8344 (Letn. 7, št. 2, 2016, str. 5-22)Type of material - article, component part ; adult, seriousPublish date - 2016Language - englishCOBISS.SI-ID - 7628385
source: Business systems research journal : international journal of the Society for Promotion of Business Information Technology (BIT). - ISSN 1847-8344 (Letn. 7, št. 2, 2016, str. 5-22)
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Drobne, Samo | 11215 |
Lakner, Mitja | 03533 |
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