This function computes the sequence distance based transcriptome divergence index (TDI) introduced by Quint et al., 2012.
a standard PhyloExpressionSet or DivergenceExpressionSet object.
The TDI measure represents the weighted arithmetic mean (expression levels as weights for the divergence-stratum value) over all gene divergence categories denoted as divergence-strata.
TDI_s = ∑ (e_is * ds_i) / ∑ e_is
where TDI_s denotes the TDI value in developmental stage s, e_is denotes the gene expression level of gene i in stage s, and ds_i denotes the corresponding divergence-stratum of gene i, i = 1,...,N and N = total number of genes.
Internally the function is written in C++ to speed up TDI computations.
a numeric vector containing the TDI values for all given developmental stages.
Quint M et al. (2012). A transcriptomic hourglass in plant embryogenesis. Nature (490): 98-101.
Drost HG et al. (2015). Evidence for Active Maintenance of Phylotranscriptomic Hourglass Patterns in Animal and Plant Embryogenesis. Mol Biol Evol. 32 (5): 1221-1231 doi:10.1093/molbev/msv012.
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