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hylo everyone. i want to solve one of quarry about my econometric research please
i have applied ARDL model in my dissertation but i haven't take log nor go for impulse response .. my results are consistent.. can anyone tell how can i defend my this point with logic that it isn't necessary to take log and impulse response function?

Taking log is not at all necessary unless you are interested in:

a. Analyzing the elasticity
b. removing heteroskedasticity (if it exists)

Impulse response functions are needed for a specific kind of analysis only if you are not interested in it, you might not show it.

thanks alot