I have used Gompertz model to estimate an equation.

I have followed these two sites they explain it all.

http://www.weibull.com/RelGrowthWeb/parameter_est_least_squares.htm

http://www.fao.org/DOCREP/006/X8498E/x8498e0e.htm

This method uses squares to approximate the equation.

Following from first site because the variables are different names.

I have calculated Y=((A*B)**C)**X

** means to the power of

anyways further down I have calculated G(0), Y(0), and D(0)

**Problem:**

I am currently calculating ^V(0) = (D(0)T * D(0))**-1) * D(0)T * Y(0)

T means Transpose D(0)

**-1 means inverse

Now this equation uses matricies to solve for ^V(0)

I have multiplied this sucessfully (D(0)T * D(0))**-1) * D(0)T

but this gives a 3 x 3 matrix in my result

and Y(0) is 1x6 matrix.

Obviously cannot multiply these 2 matricies.

In the example they dont elaborate on the example for this equation.

Can someone please tell me what am I doing wrong?