Hello, I'm writing a thesis about SRISK in the banking sector. My dataset goes from 2005 until 2020 and I'm going to use the following formula to compute the systemic risk SRISK=k⋅DEBT−(1−k)⋅EQUITY⋅(1−LRMES) from V-lab.

On my dataset, I have banks that were listed in the stock exchange after 2005, therefore there are no closing prices for these banks at the beginning of the sample period. However, there is information about the liabilities for that same sample period.

My doubt is the following: should I consider these liabilities when computing the SRISK even though there are no closing prices (so no value for the LRMES) or should I ignore this data and compute the SRISK only for the period that I have the information about the closing prices?

Thank you for your help