Figure 6.

Directed acyclic graph showing alternative putative relationships between variables A, Y, C1, C2, C3, C4, and C5 in which C2 and C3 are measured with error (measured variables are C2* and C3* and variables affecting their measurement are UC2 and UC3).

Evans et al. BMC Medical Research Methodology 2012 12:156   doi:10.1186/1471-2288-12-156
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