<|begin_of_text|><|start_header_id|>system<|end_header_id|>

You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: congressional roll call vote data originally provided by the office of the clerk of the u.s. house of representatives. accessible through govtrak at https://www.govtrack.us/congress/votes. copyright civic impulse, llc, (2014) retrieved in bulk via instructions from https://www.govtrack.us/developers/data. data on congressional productivity and approval rate at: ornstein n, mann t, malbin m, rugg a (2013) vital statistics on congress. washington, d.c.: the brookings institution. http://www.brookings.edu/research/reports/2013/07/vital-statistics-congress-mann-ornstein.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>