Thank yo for your response,
I am currently working in a travel demand model. I came across a problem in my analysis. I have attached the leap tree structure for my model. Under my scenario, I want to reduce the demand(pass-km), whose calculations i have done outside in excel, for private vehicles and meet those demands from public (bus only, other grow constantly, the goal is to reduce private demand from 1% in 2018 to 75% in 2030. My base year and FSY are 2013 and 2014 respectively. i want to put this scenario(public vehicle penetration) to be under BAU scenario. I have used interp function (eg.2019,7%, 2018,9%).since I have ti have 100% share each year my results are peculiar. sometimes it is very low sometimes very high,
Could you please help me on this?