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A New Approach to SAM Updating with an Application to Egypt

Author

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  • M Thissen

    (University of Groningen, WSN-room 567, PO Box 800, 9700 AV Groningen, The Netherlands)

  • H Löfgren

    (International Food Policy Research Institute, 2033 K Street NW, Washington DC, 20006, USA)

Abstract

When social accounting matrices (SAMs) are updated with fragmentary data the new column and row totals are often not all known in advance. Also, the overall total of all matrix entries may not be known. This results in a situation in which the generally used RAS method cannot be applied to update the SAM, as the outcomes become unreliable with unknown totals. In this paper a generalised version of the RAS method is developed, based on information theory. This method, which incorporates the RAS method as a special case, is more flexible with respect to necessary information and improves the accuracy of the updated SAMs. In addition to developing a generalised RAS method, we present an easily applied procedure for building SAMs which reduces the time needed to update them. The generalised RAS method and the SAM building procedure are applied to a 1991–92 SAM for Egypt.

Suggested Citation

  • M Thissen & H Löfgren, 1998. "A New Approach to SAM Updating with an Application to Egypt," Environment and Planning A, , vol. 30(11), pages 1991-2003, November.
    • Handle: RePEc:sae:envira:v:30:y:1998:i:11:p:1991-2003
    DOI: 10.1068/a301991
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    References listed on IDEAS

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    Cited by:

    1. Richard Wood, 2011. "Construction, Stability And Predictability Of An Input-Output Time-Series For Australia," Economic Systems Research, Taylor & Francis Journals, vol. 23(2), pages 175-211.
    2. Mark Thissen & Maureen Lankhuizen & Frank (F.G.) van Oort & Bart Los & Dario Diodato, 2018. "EUREGIO: The construction of a global IO DATABASE with regional detail for Europe for 2000-2010," Tinbergen Institute Discussion Papers 18-084/VI, Tinbergen Institute.
    3. M. Alejandro Cardenete & M. Carmen Delgado & Patricia D. Fuentes & M. Carmen Lima & Alfredo J. Mainar & Jose M. Rueda-Cantuche & Sébastien Mary & Fabien Santini & Sergio Gomez y Paloma, 2015. "Rural-urban social accounting matrixes for modelling the impact of rural development policies in the EU," JRC Research Reports JRC94394, Joint Research Centre.
    4. Lofgren, Hans & El-Said, Moataz, 2001. "Food subsidies in Egypt: reform options, distribution and welfare," Food Policy, Elsevier, vol. 26(1), pages 65-83, February.
    5. Kherallah, Mylene & Lofgren, Hans & Gruhn, Peter & Reeder, Meyra M., 2000. "Wheat policy reform in Egypt: adjustment of local markets and options for future reforms," Research reports 115, International Food Policy Research Institute (IFPRI).

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