Yonghong An, Michael R. Baye, Yingyao Hu, John Morgan, and Matt Shum,
"Identification and Estimation of Online Price Competition with an
Unknown Number of Firms", Journal of Applied Econometrics, Vol. 32,
No. 1, 2017, pp. 80-102.

The data used in this paper combine two sources. The first one
includes the price data from the UK price comparison website, Kelkoo,
and the second one contains additional information of products from
PDAdb.net, a mobile device database. 

The price data from Kelkoo are confidential, and permission to use this
data set should be directed to uk-product-dev@lists.kelkoo.com or 0203
402 9400. 

The analysis in the paper is based on listed prices (inclusive of
taxes and shipping) charged by firms selling 18 models of PDAs over
the period from 18 September 2003 through 6 January 2004 on
Kelkoo.com.uk. The variables we use are: listing date, number of
listings on each date, listed price, and product name. 

The additional information on products are collected from PDAdb.net, a
mobile device database. The data file is an ASCII file
characteristics.txt. There are 5 variables and 18 observations for
each variable. The 18 observations are for 18 models of PDAs, and the 5
variables are the product name, process, ram, bluetooth (binary), and
camera (binary). 

Yonghong An
y.an@tamu.edu