Hello, I am trying to use a data set that requires both of the following functions for my project. Are there macros or add-ins that can be suggested? if not, are there softwares that can be recommended?

1. Force y-intercept through the origin: I found this in Excel.

2. Robust regression: is there a macro that will allow Excel to do a robust weighted regression? More specifically, each x and each y have a unique error value that I give it (in a column beside it) specific to each data point. I'd like Excel to 'weight' each data point in a robust regression and add these error bars to the plot.

Other softwares do one or the other, often requiring computer code, but is there a software that enables both of these features - hopefully Excel?

Thank you.