<|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: data are available from the following sources: 1. yahoo! finance (http://finance.yahoo.com). data taken from yahoo! finance include all stock prices used as well as the nasdaq index and gold prices. 2. clarksons database (http://sin.clarksons.net). the baltic dry index historical values were taken from this database. 3. nasdaq financial database (http://www.nasdaq.com/markets/wheat.aspx). this database was used to determine historical wheat prices.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>