why clustered standard error why is standard error clustered what is the difference between pooled ols and clustered standard errors what are pooled ols vs clustered standard errors what is pooled ols standard error what is the difference between cluster standard error and pooled ols results why use a standard error cluster which standard error is the best? when do standard error estimates become pooled what is the difference between a pooled standard error and clustered standard error? what is the difference between regular errors and pooled ols why use pooled standard errors why do I use clustered standard errors and pooled ols? can you explain why clustered standard errors and pooled ols are appropriate? what do standard error cluster what is the difference between clustered standard error and pooled ols clustered standard error pooled ols why is standard error clustered and pooled are standard error estimates pooled why would standard error estimates be compared to pooled ols