<|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 first improvements which we have planned are particularly due to the limited **data** basis for the estimation of probabilities of death and migration and expected number of births in each municipality. Even if we had the **data** for say 5 years, the variance on an average over the years would be very large for small municipalities. W e are now thinking of combining the municipalities into groups in order to obtain a larger **data** basis per region. We have not yet decided how we shall form these groups of municipalities, but a study concerning the dependency of migra tions on variables both of a demographic and of a non-demographic nature has been started.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

no<|eot_id|>