Thank you Carlos. The actual issue is that when I'm trying to add the
observation data in the form of ASCII files, the model doesn't accept it,
whereas if I add is as an excel file, I'm able to assign. I have a problem in
this method as well. When I run the model, I'm unable to see the points plotted
on the scatter plot though the model accepts the observation points. I just
followed the same steps done on the tutorial. Also what is it about parameter
and confidence interval. I have no idea about what it needs to be for my study
area.