How the variance analysis or ratio analysis will be useful in comparison with other entities if their is a difference of size having a same industry?

Variances are the difference between the amounts budgeted and the amounts actually incurred 

Variance Analysis is the basis of any performance evaluation system using a budget .

Variances are the difference between the amounts budgeted and the amounts actually incurred .

standard costs are budgeted costs established to improve productivity and efficiency and these standard costs can be compared to Par in golf course , so actual costs of entities which show the actual performance of these entities compared to a standard or budgeted costs for the same industry , so Variance analysis is useful for making comparisons between entities performances in the same industry