<|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: Here Equations (2) and (3) mean that U and X together account for all confounding in the observational data, but the observed covariates X alone are not enough. Moreover, we impose the overlap condition 0 < P (A = 1 | U, X, G = O) < 1, which is a standard assumption in causal inference literature. Because of the unmeasured confounders U , the observational **data** alone is not enough to identify the treatment effect parameter τ in eq. (1).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

no<|eot_id|>