Contribution Analysis
I have run a contribution analysis of all 19 agricultural sectors in a multicounty study area. I have the data from both the model overview and contribution analysis and I was wondering if it is appropriate to to compare the total employment from the model overview with either the direct or total employment effects of my contribution analysis to get the percent of total employment that the ag sectors account for.
The total employment from the model overview is 25714.40 and the direct employment from my contribution analysis is 2832.80 and total employment effect is 3441.10. Is it accurate to say that the ag sectors account for either 11.0% of jobs (using only direct employment effects) or 13.4% of jobs (using total effects)?
These same questions apply to labor income, value added and output.
Thanks!
Liz

Hi Elizabeth. First, we suggests that you make sure that the sum of direct employment for all 19 Agricultural sectors in the Study Area Data equals the sum of the total employment for these sectors in your Contribution Analysis results. If they match, then the correct computation would be to say that the Ag sectors account for 13.4% of jobs. We assume that this figure is the product of total employment effects from your contribution analysis results divided by the total employment from the Model overview screen (Study Area Data is better to perform these and other computations). . And yes, this would apply to labor income, value added and output as well. In fact to make the computations a little easier, you might consider using the data in the “Study Area Data” section of the model. The reason being is that you will have to develop estimates of Labor Income (Employee Compensation + Proprietor Income) and Value Added (Employee Compensation + Proprietor Income +Other Property Type Income +Tax on Production and Imports) to derive Ag. LI and VA as percentages of total LI and VA in the study region. Please let us know if we can be of further help. 
As suggested, I compared the employment provided in the Industry Detail with the total employment calculated from the contribution analysis and they were not the same. According to the Study Area, total employment for the 19 ag sectors (I'm assuming this is direct only) is 2884.60. My contribution analysis found a direct employment figure of 2884.5 and a total employment figure of 3502.70. Should the direct effect of the contribution analysis match the employment of the study area for the 19 sectors? 
I also have an additional question. I'm running another contribution analysis to determine the contribution of the housing market (sales and new construction) on a multicounty region. Specifically, I'm looking at sectors 37construction of new residential permanent site, and 360real estate establishments. I was wondering if I should run a single industry contribution analysis on these separately, or if it would makes sense to combine them into a multisector analysis. I'm not sure of the best tools I should be using to make these type of decisions. Thanks, Liz 
Hi Elizabeth. Since you are only dealing with two industries, it would be very easy to run a contribution analysis on each sector. You would use the same procedure for running a single industry contribution analysis but use the methodology for each sector. You would create an Activity for each Event/sector and then a scenario for each Event. Don't forget to set your "Event Year" before entering your event value for each sector. When finished run your model and view your results for each scenario. Please let us know if we can be of further help to you.
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