IMPLAN county results vs. NASS

Hello Shaun, State-level NASS data on crop value of production is one of our sources for estimating agricultural output. To answer any specifics about the relationship between the data you are observing and any NASS data, we need more information about which crop sectors, which counties, and which NASS reports you are using for comparison. We do not use NASS county-level estimates since we have not found them to be consistently available for all crops and states. Regards, IMPLAN Staff

I have attached the first of several files in the hope that you can tell me what I have done wrong (attaching all of them caused a server error so I am sending them in 3 messages). 1) All California county crop summary, downloaded at https://www.nass.usda.gov/Statistics_by_State/California/Publications/AgComm/Detail/ 2) Two county IMPLAN models using the 2014 county data files, Tulare and San Joquin, as they have the biggest diference) 3) Study detail spreadsheets for Turlare and San Joaquin counties 4) A table comparing all of the central California counties and their IMPLAN vs. NASS results for tree nuts I was expecting differences in the proportion of induced impacts, but not that there would be substantial differences in the output numbers

County details

The IMPLAN models are too big to attach. I just did the normal: 1) New Model and named it 2) The list of data files pops up 3) I click on county file 4) I leave Build With Multipliers checked 5) I click on Study Area Detail when it is done

Hello Shaun, We must first reiterate that we do not use NASS county-level estimates since we have not found them to be consistently available for all crops and states; rather, we use state-level data and distribute those data to counties based on the latest Census of Agriculture (please see the attached document for more information on our farm sector data sources and procedures).  Secondly, while we use NASS value of production data where possible (because it includes on-farm use and inventory) we use ERS cash receipts data where NASS does not provide enough sector detail.  One such case is for nuts.  As you can see in the NASS Crop Values Summary (http://usda.mannlib.cornell.edu/usda/nass/CropValuSu//2010s/2015/CropValuSu-02-24-2015_correction.pdf), there are no state-specific tables for individual nuts, only Fruits and Nuts combined.  We do note that ERS cash receipts data for almonds, pecans, pistachios, and walnuts for California as a whole sum to 9,337,130,000, whereas the same sum from the report you attached is 11,626,932,200, indicating that there are some differences between the two sources.  Please note the Peanuts are not included in IMPLAN’s Tree Nut sector, but rather the “All Other Crops” sector. If you think that agricultural values are different from what the model reports, you can utilize IMPLAN Pro's customization features. Regards, IMPLAN Staff [attachment=717]h8326779.pdf[/attachment]