<|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: the authors do not own the data underlying this study. all national income dynamics study files are available from the datafirst, university of capetown database (http://www.datafirst.uct.ac.za/dataportal/index.php/catalog/453). all consumption data are from the south african national health and nutrition examination survey and can be obtained from the human sciences research council by contacting lucia lotter, manager, data curation (llotter@hsrc.ac.za).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>