<|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: county-level farm yield data are available from the national agricultural statistical service (nass) of the u.s. department of agriculture (usda). predicted prices (futures) are obtained from the chicago mercantile exchange & chicago board of trade (cme group inc.). interested researchers can access the county-level and the predicted price data from http://www.usda.gov/ and http://www.cmegroup.com/, respectively.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>