## Sample Problem Solutions - Regressions (REGs)

### The following list provides the PolyMath Reports that give the solutions to all the Sample Problems that are solved as REQs. The PolyMath Report can be generated during the problem solution. This list is in approximate order of increasing problem difficulty. The starred entries can only be solved by the Paid version of PolyMathLite.

S. 12(b)  - 2nd Degree Polynomial Fit to BOD Data  BOD = a0 +a1*Time + a2*Time^2

S. 13  - Fitting Polynomials to P Versus T Data  P = a0 + a1*T +a2*T^2 + a3*T^3 + a4*T^4

S. 14  - Simple Multiple Linear Regression  y = a0 + a1*x1 + a2*x2

S. 28  - Linear Regression  Pressure Versus Temperature Data

S. 29*  - Nonlinear Regression  Pressure Versus Temperature Data (Requires Solution Algorithm L-M)

S. 30*  - Nonlinear Regression  Catalytic Reforming Reaction Rate Expression (Requires Solution Algorithm L-M)

S. 31(a)* - Multi-Linear Regression  Heat of Hardening of Concrete

S. 31(b)* - Multi-Linear Regression through Origin  Heat of Hardening of Concrete