Updates to Industry by Industry Matrices

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    IMPLAN Support
    Hi. Thank you for your post. For the trade-flow model, which is the default model IMPLAN uses to estimate RPCs and multipliers, the RPCs are estimated each year using the latest data. The IxI matrix is constructed from whatever dataset is used to create an IMPLAN model. So a model that uses 2013 IMPLAN data has RPCs, multipliers, and an IxI matrix that are estimated using IMPLAN 2013 data. IMPLAN 2013 data incorporates the most recent data available from all sources. Some of these data sources are lagged, and we project them based on more recent trends. Please consult this page for explanations of various parts of the data production process: http://implan.com/index.php?option=com_content&view=article&id=821&Itemid=1555 The 2011 paper (if you are referring to the MCRSA Proceedings Paper) was discussing the Econometric RPC method, which is an alternative to the Trade Flow model method and is used for zip-code and congressional district models since our trade flow model does not currently estimate trade flows for those geography types. Here is the latest paper that explains the Trade Flow model: https://implan.com/index.php?view=download&alias=138-v3-gravity-model&category_slug=version-three-files&option=com_docman&Itemid=1480 Thank you.
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