ET-TDT is a procedure to combine the benefits of measured haplotype analysis with TDT to find which haplotypes or groups of haplotypes, as defined in an evolutionary tree, are responsible for increased (or decreased) relative risk for a genetic condition.
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Howard Seltman, Kathryn Roeder, and B. Devlin,
Transmission/Disequilibrium Test Meets Measured Haplotype Analysis: Family-Based Association Analysis Guided by Evolution of Haplotypes
Am. J. Hum. Genet., 68:1250-1263, 2001