How to organize data set to assess by DEA model?

[asm towhid]

Beloved,

I would like to use output oriented two-stage DEA model. May I have some suggestions regarding this topics? I am planning to use "Return to Scale" model. I have six companies from 2009 to 2016 for each individual companies. for example:

Company Name	Year	X1	X2	X3	X4	X5	X6	Y1	Y2	Y3
Company A	2009
	2010
	2011
	2012
	2013
	2014
	2015
	2016
Company B	2009
	2010
	2011
	2012
	2013
	2014
	2015
	2016

I couldn't understand which column supposed to be "dmu". How can I manage my dataset to analyze at a time and to get results for each year? As it is a two-stage model, so in the first stage Y1 (output) will be used an input for the second stage. In this case, I have used following syntax,

/* CRS Output-oriented Two-stage DEA Model */

dea X1 X2 X3 X4 X5 X6 = Y1 Y2 Y3, rts(crs) ort(o) stage(2)

/* VRS Output-oriented Two-stage DEA Model*/

dea X1 X2 X3 X4 X5 X6 = Y1 Y2 Y3, rts(vrs) ort(o) stage(2)

Is it the correct syntax to have the appropriate result? Your suggestion would be appreciated.

Note: Conducting Stata V 14.2

Thanks in advance!