<prompt> Human: I just turned 30 and my 401k is at 83k. Currently I am 100 in the SP500 but I will probably scale back the risk somewhat soon. Below are my year-to-year 401k values. Generally whenever I get a raise at work I add an additional 1-2 of that raise to my 401k.2013...1872 2014...9388 2015...18051 2016...25523 2017...39560 2018...62394 2019...83000 So, is it fair to fit a polynomial to that? I assume the slope will be a bit misleading since currently I am 100 in SP500 eg my gains will slow down, most likely, once I got for less risky options, but of course my annual contributions will continue to rise as well.Just curious since if I fit a polynomial to it, I have a projected 2.5M at my retirement age with an R2 of basically 100.  <response>: Doing anything more complex than assuming stocks will return a certain percent per year I assume 6.5-7 going forward is pointless. Id leave the polynomials in math class. 