BLP, dicrete choice model

[Rezgar Mohammed]

Hi all,
I am using blp command in Stata 12. My data consists of quantities, prices and product characteristics of 12 brands in 10 states during 36 months (market). When I use the command “elast(price,1,brands)” and then “matrix list e(elast)”, it gives me a [120,120] matrix of elasticities for market one only. How can I get the [12,12] elasticities for all states together, and for each state separately. I also want to know how to get markups.
Thank you.
Rezgar Mohammed

This is what I used for non-demo info.

blp s x1 x2 brand1 brand2 brand3 brand4 brand5 brand6 brand7 brand8 brand9 brand10 brand11, stochastic(x1, x2, price) endog(price=w1 w2 w4 w5 w12 w22 w42 w52 x1w1 x1w2 x1w4 x1w5 x2w1 x2w2 x2w4 x2w5 x1s x2s d1w1 d1w2 d1w4 d1w5 d2w1 d2w2 d2w4 d2w5 d3w1 d3w2 d3w4 d3w5 d4w1 d4w2 d4w3 d4w4 d4w5 d5w1 d5w2 d5w4 d5w5 d6w1 d6w2 d6w4 d6w5 d7w1 d7w2 d7w4 d7w5 d8w1 d8w2 d8w4 d8w5 d9w1 d9w2 d9w4 d9w5 d10w1 d10w2 d10w4 d10w5 d11w1 d11w2 d11w4 d11w5 d12w1 d12w2 d12w4 d12w5) markets(market) optinst(w1 w2 w4 w5) elast(price,1,brand)

[Marcos Almeida]

Hello Rezgar,

Welcome to the Stata Forum / Statalist.

Please read the FAQ. There,you will find important recommendations on how to post a query, share command and output, etc.

For example, you may use the CODE delimiters or install the SSC dataex so as to share data and commands.

Also, it is recommeded to inform if it is a user-written command, and not a regular command in Stata.

For example, since it is far from my field, I needed to search information about the user-written -blp - in order to know that it is a "Stata module to estimate Berry Levinsohn Pakes random coefficients logit estimator", written by David Vincent.

To end, here you have a presentation by David Vicent, where you find information on blp as well as elasticities.

This is the furthest I can go, because the topic is far from my field.

Hope that helps.