Inference for an age-dependent, multitype branching-process model of mast cells
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Abstract
We consider an age-dependent, multitype model for the growth of mast cells in culture. After a colony of cells is established by an initiator type, the two possible types of cells are resting and proliferative. Using novel inferential procedures, we estimate the generation-time distribution and the offspring distribution of proliferative cells, and the waiting-time distribution of resting cells.
Key words
Cell kinetics Hemopoiesis Inference for stochastic processesList of Notations
- Bi
cumulative distribution function for the time until branching of a cell of type i
- bi
probability density function for the time until branching of a cell of type i
- bi
b i (1−D i )
- Di
cumulative distribution function for the time until death of a cell of type i
- di
probability density function for the time until death of a cell of type i
- \({{f_\Gamma (t;\gamma ,\eta ,\lambda ) = \lambda ^\eta (t - \gamma )^{\eta - 1} e^{ - \lambda (t - \gamma )} } \mathord{\left/ {\vphantom {{f_\Gamma (t;\gamma ,\eta ,\lambda ) = \lambda ^\eta (t - \gamma )^{\eta - 1} e^{ - \lambda (t - \gamma )} } {\Gamma {\text{(}}\eta {\text{)}}}}} \right. \kern-\nulldelimiterspace} {\Gamma {\text{(}}\eta {\text{)}}}}\)
probability density function of a gamma distribution
- Gi
cumulative distribution function for the lifetime of a cell of type i
- G1*2
Convolution of G1 and G2
- ¯Gi
1−G i
- gi
probability density function for the lifetime of a cell of type i
- Li
likelihood of a history of type i
- m
average number of proliferative daughters produced by dividing cells
- Mij(t)
the expected number of type-j cells in a colony at time t if that colony began at time 0 with one type-i cell
- Mi+(t)
M i0 (t) + M i 1(t) + M i 2(t)
- prs
probability that a dividing cell produces r proliferative and s resting daughters
- ti
times defining colony histories. See IV.2.1
- T0
time to division of an initiator cell
- T1, T2
times from birth to division of the two daughters of an initiator cell
- T(1), T(2)
order statistics of T1 and T2
- γ
minimum value of a gamma distribution
- λ
scale parameter of a gamma distribution or of an exponential distribution
- μ
probability per unit time of death for proliferative and resting cells
- πrs
expected value of p rs when there is heterogeneity
- η
shape parameter of a gamma distribution
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