Collapsing NAICS Codes

Helo Dadhi, It is certainly possible to aggregate sectors in IMPLAN; in that case, the resulting aggregated production function and relationships (output per worker, income per worker, etc.) would be weighted by each of those three industry's current level of output in the U.S., which may or may not be in line with the actual split-out of spending that would occur in each of the three sectors. In the 2012 data, these proportions are 54%, 32% and 14%, respectively. If you choose not to aggregate your model, the simplest solution would be to assume an equal distribution (or equal expenditure share) between the three and divide the million dollars accordingly. However, this assumes that on a typical trip to your area, visitors spend an equal amount on lodging, tour guides, and amusement parks - depending on the nature of your study area this may or may not be reasonable - you will have to use your analyst judgment and knowledge of the area to make that call. Perhaps you could do a couple of analyses under a couple different spending split assumptions and report the range of results as opposed to a single set of results. You can use the Help > Sector Search function in IMPLAN or the following bridge table to match your 3 NACIS codes to IMPLAN sectors: http://implan.com/v4/index.php?option=com_multicategories&view=article&id=633:633&Itemid=71.