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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/2204

Title: Classification trees versus multinomial models in the analysis of urban farming systems in Central Africa
Authors: Speybroeck, N
Berkvens, Dirk
Mfoukou-Ntsakala, A
HENS, Niel
Van Huylenbroeck, G
Thys, E
Issue Date: 2004
Citation: AGRICULTURAL SYSTEMS, 80(2). p. 133-149
Abstract: This study was aimed at the identification of location and household characteristics influencing the choice of keeping livestock or practising crop production in a post-conflict region in Central Africa. Two thousand eight hundred randomly selected families from Brazzaville (Congo) were surveyed. From these, 6% are both keeping livestock and producing crops, 3% are keeping livestock only, 24% are producing crops only and 67% are not producing crops nor keeping livestock. From these four groups, respectively, 135, 84, 246 and 245 households were interviewed to collect further data on household and location characteristics. Non-parametric and parametric techniques were compared as tools to analyse the groups. In the non-parametric classification tree method CART following variables were identified as being important for the engagement in keeping livestock or urban agriculture: keeping livestock before 1997, practising agriculture before 1997, property size, locality, income, availability of water, professional activity and level of instruction. Including surrogate variables resulted in extra variables: age, availability of electricity and sex. In the multinomial regression only the most important variables from the classification tree were withheld and other insights were obtained. The results of this research highlighted the shortcomings of multinomial regression. Fitting a full model containing all possible interactions becomes an impossible task with 20 explanatory variables. Using the classification tree information in a multinomial model appears the most appropriate solution, and this method is a useful tool for further work in the analysis of livestock and crop production systems. The importance of the historical component in the decision to practise crop production and keep livestock was demonstrated. Being involved in crop production develops roots, which cannot be destroyed by impediments such as periods of conflict. (C) 2003 Elsevier Ltd. All rights reserved.
Notes: Inst Trop Med Prince Leopold, Dept Trop Anim Hlth, B-2000 Antwerp, Belgium. Fac Agr & Appl Biol Sci, Dept Agr Econ, B-9000 Ghent, Belgium. Limburgs Univ Ctr, Ctr Stat, B-3590 Diepenbeek, Belgium. URSPA, Brazzaville, Congo.Speybroeck, N, Inst Trop Med Prince Leopold, Dept Trop Anim Hlth, Natl Str 155, B-2000 Antwerp, Belgium.nspeybroeck@itg.be
URI: http://hdl.handle.net/1942/2204
DOI: 10.1016/j.agsy.2003.06.006
ISI #: 000220877900002
ISSN: 0308-521X
Category: A1
Type: Journal Contribution
Validation: ecoom, 2005
Appears in Collections: Research publications

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