 However, it has been shown that classical statistical approaches , like those based on the ordinary least squares estimator, fail to provide reliable confidence intervals when used with bandit data .
<coherence>  However, it has been shown that classical statistical approaches , like those based on the ordinary least squares estimator, fail to provide reliable confidence intervals when used with bandit data .
 However, classical statistical approaches , like those based on the ordinary least squares estimator, fail to provide reliable confidence intervals when used with bandit data .