Umar,
Yeah I have checked it and by discussing it with other engineers came to find out that ETABS 16 explicitly doesn't provide data/excel format for identifying the weak story. There is a table for finding out stiffness of each story thereby helping us identify Soft Storey, but Weak Story needs to be done manually. Software MIDAS provides a table in results clearly displaying Shear Strength of particular storey, but in Etabs it is not present. Yeah by using displacements of adjacent floors it is possible to identify Soft Storey, but that method is not needed now as ETABS clearly gives us Stifnesses of each storey thereby easily helping us to find out Soft Storey in a system.
Sorry, I have quoted ACI for irregularities its ASCE
Regards,
Areeb Ahmed