Verified Certificate

Supported by the following organizations

This is to certify that Abraham Valenzuela Sanchez successfully completed and received a passing grade in PH559x: Causal Diagrams: Draw Your Assumptions Before Your Conclusions a course of study offered by HarvardX, an online learning initiative of Harvard University.

Noted by

Miguel Hernán

Miguel Hernán

Kolokotrones Professor of Biostatistics and Epidemiology Harvard T.H. Chan School of Public Health

About edX

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About edX Verified Certificates

An edX Verified Certificate signifies that the learner has agreed to abide by the edX honor code and completed all of the required tasks of this course under its guidelines, as well as having their photo ID checked to verify their identity.