In the circulatory system, red blood cells are constantly being destroyed and replaced. They carry oxygen throughout the body and they must be main- tained at a constant level. The spleen filters out and destroys a fraction of the cells daily and the bone marrow produces a number proportional to the num- ber lost on the previous day. The cll count on day is modeled as follows (see Edelstein-Keshet, 1988, pp. 27, 33): R, = number of red blood cells in circulation on day t. M, = number of red blood cells produced by marrow on day t. f = fraction of red blood cells removed by spleen, 0 < f < 1. y = production constant, y > 0. The system of difference equations satisfied by R, and M, is R, = (1 - )R, + M,, M = yfR,. (a) Express the system as a matrix equation X, = AX,. Find the cigenvalues of A and determine their sign. (b) Let the positive eigenvalue A, = 1 (R, is approximately constant); then what does this imply about y? (c) Let A1 = 1. Find A2. Then describe the behavior of R.
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
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