How to combine multiple time series or linear models?

What would be the best suited method to analyze the following:

 Week    Location     Revenue(\$MM)     TrainingEvent
1       abc          1.2              0
2       abc          1.2              1
3       abc          1.6              0
4       abc          1.5              0
....    abc          ...              ...
1       xyz          2.1              0
2       xyz          2.0              0
3       xyz          2.2              1
4       xyz          2.9              0
...     xyz          ...              ...


The idea is that there are several hundred locations and 1 year worth of weeks, and training is conducted periodically to coach employees on proper sales techniques. I want to quantify the impact of training on revenue in future weeks. Rather than performing several hundred linear regressions with lagged variables and/or time series ARIMA type models, and somehow determining an average effect after standardizing the revenue variable, I'd like to think there is some sort of method that will essentially allow me to do all of this as one model.

Any suggestions?

• Can you look at the sales of the trained employees, or do you only have aggregate data for each location? – gung - Reinstate Monica Jul 10 '15 at 15:09
• Yes, only the aggregate. I believe these are large group training exercises that take place in the mornings before the stores open. – Brandon Metzger Jul 10 '15 at 15:18