Learn how representative samples and random samples differ and why combining them minimizes sampling bias for accurate data.

Perhaps you saw the headlines this weekend: “Sexting: Just About Everyone’s Doing It,” from Discovery News, or “Online survey finds 8 in 10 adults have engaged in sexting,” from CNN. Wow – that’s ...

Length-biased time-to-event data are commonly encountered in applications ranging from epidemiological cohort studies or cancer prevention trials to studies of labor economy. A longstanding ...