The Logistic model for incremental data 
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The logistic growth curve (sometimes called the Verhulst model as it was first proposed as a model of population growth Pierre Verhulst 1845, 1847) is one of the simplest of the Sshaped growth curves. A generalization of the logistic, which is no longer symmetrical about the point of inflection, was developed by Richards (1959) and is termed the Richards curve or generalized logistic. There are a number of different ways that this equation can be written (see Logistic curve). When using incremental data the version used is
where t is age where k is the growth rate b a scaling parameter and L∞, termed 'L infinity', is the asymptotic length at which growth is zero.
