This means that if we build a histogram of the realisations of the sum of independent identical discrete variables, the curve that joins the centers of the upper faces of the rectangles forming the histogram converges toward a Gaussian curve as approaches infinity, this relation is known as de Moivre Laplace theorem.
42.
It can be seen that the " Z ( k, z ) " functions are the kernels of the Fourier transform or Laplace transform of the " Z ( z ) " function and so " k " may be a discrete variable for periodic boundary conditions, or it may be a continuous variable for non-periodic boundary conditions.
43.
The explanatory variables may be of any dummy variables ( or indicator variables ), i . e . separate explanatory variables taking the value 0 or 1 are created for each possible value of the discrete variable, with a 1 meaning " variable does have the given value " and a 0 meaning " variable does not have the given value ".
