estimation of transition probabilities using a transition counts and start vector.
transitionprobbytotals(idTotCnt,snapshots,interval,method)a list structure containing m-by-m matrices of transition counts, 1-by-m vectors start counts, and a string with values 'duration' or 'cohort'.
integer indicating the number of credit-rating snapshots per year to be considered for the estimation. Valid values are 1, 4, or 12. The default value is 1, i.e., one snapshot per year. This parameter is only used in the 'cohort' algorithm.
the length of the transition interval under consideration, in years. The default value is 1, i.e., 1-year transition probabilities are estimated.
estimation algorithm, in string format. Valid values are 'duration' or 'cohort'.
Returns m-by-m matrices of credit transition probabilities
MathWorld.com (2011). Matlab Central http://www.mathworks.com/matlabcentral/. Mathtools.net http://www.mathtools.net/.