<|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: 1. data are from the reference cheng et al. (2011) whose authors may be contacted at caverlee@cse.tamu.edu. cheng z, caverlee j, lee k, sui dz (2011) exploring millions of footprints in location sharing services. in: proceedings of the 5th international aaai conference on weblogs and social media (icwsm). 2. data on american community survey can be found at http://www.nyc.gov/html/dcp/html/census/popacs.shtml 3. gis data on nyc neighborhoods can be found at http://www.baruch.cuny.edu/geoportal/nyc_gdb/.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>