I have problems with the interpretation of a scatter plot in a multiple linear regression (OLS method). I have posted an image below of the scatter plot of the standardized residuals vs the predicted value of my dependent variable (C).
My question is: in this graph can I assume that my linear regression model is good? The disposition of the residuals is suspect and this often is trace of nonlinear relationship between the variables. What do you think of my case? Thanks to everyone.
EDIT: here is the dataset https://mega.nz/#!ehtEERJA!_3OMnu2GutFmM9R9fZjfQIthF7bzCNMaT_g1Q2033ko
C is the dependent variable, the other variables are the indipendent. Durbin Watson stat: 1,241603582 Shapiro-Wilk test shows that residuals are normally distributed