title: How to solve an equation of the form p = aw + bx + cy + dz where I have thousands of a-e data sets?
body: <p>I have thousands of data sets of (p, w, x, y, z), and I'm pretty sure that they fit an equation of the form <strong>p= aw + bx + cy + dz</strong>, with p rounded up in some way.</p>
  
  <p>I'd like to write a program to solve for the constants a, b, c, and d, given all the data sets for the variables and result that I have. Alternatively, if there is software that can already do this, that would be great. Any suggestions, or any Google keywords I can use to do further research?</p>