问题描述：
regressed a linear panel data
we regressed our measures of clustering and reach,and their interaction on
annual firm patent counts using a linear panel data model.
We did so using contemporaneously measured firm patents and one-,two-,and three-year lags of firm patents.
we regressed our measures of clustering and reach,and their interaction on
annual firm patent counts using a linear panel data model.
We did so using contemporaneously measured firm patents and one-,two-,and three-year lags of firm patents.
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