modelling help

[am_yzc]

Hi everyone.
I need help. I had problems modeling.
I want to calculate the input and output of residential buildings. The output is the calculation of the input and its probability of abolition. The probability of abolition follows the probability density function of normal distribution, and the input of each year will produce certain abolition in the following years。
Fout=sum(Fin(t')*L(t,t'))(t'=0,1,2...,t)
L(t,t')=exp(-(t-t'-u)/2o^2)

Thank you

[R. S. Abdulrahman]

Hello everyone.
i am having issues modelling, particularly the dimensional test. How do i ensure that all units are captured correctly relative to the stock, rate and auxiliary variables?