I have done a presentation where I have used regression equation to know the relationship between productivity and profitability. Now to get a certificate, I have been asked to criticize my work and create a one page study on what alternative method I could use to check the relationship other than regression equation. For now Google is not helping me. Can anyone help me suggest something?
closed as too broad by John, Christoph Hanck, Nick Cox, gung - Reinstate Monica♦, AdamO Jan 20 '16 at 14:23
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
There are different ways to do a prediction analysis or a regression if you want and maybe the answer to your question is a bit too broad.
You can do a classical regression with linear or non-linear model, which i think is what you have done.
You can do a regression with a Bayesian approach if you want to weight more your "a-priori knowledge":Wiki
You can have a machine-learning approach:Wiki
You can apply non-parametric methods if you don't know the population distribution:Wiki
You can apply robust regression methods:Wiki
I think there is some material here to start investigating your answer