Matching on preperiod trend produces a matched sample
with similar trends in the treatment and control groups by construction.
In the matched sample
of 19,552 patients, there was no difference in mortality (hazard ratio for long-term use, 1.06; 95 percent confidence interval, 0.95 to 1.18), but the risk for suicide was elevated among those with long-term use (hazard ratio, 2.33; 95 percent confidence interval, 1.14 to 4.79).
The matched sample
used to develop the ADP National Employment Report was derived from ADP payroll data, which represents 411,000 American clients employing nearly 24 million workers.
In this section, we lay out the matching approaches that we consider and discuss how we will assess whether they generate a matched sample
that is well balanced on our observable characteristics and has good common support.
To circumvent potential self-selection issues that arise from the switching sample, we further explore the impact of market structure by creating a matched sample
of NASDAQ and NYSE firms on the basis of criteria that the prior literature deems important in explaining PDRs.
The 361 matched sample
(Table-III): It could be argued that 154 workers, although who replaced those who had left in the un-matched sample (although randomly selected) were inherently of better haemoglobin status.
A propensity score matched sample
takes characteristics of the veteran group (such as age, gender, and race) and draws a sample from the rest of the population so that the proportions of certain demographic characteristics of the control group align with the veteran group.
The analysis of teacher retention was based on a matched sample
of over 2,600 teachers in Chicago TAP and conventional public schools.
The financial performance of a sample of private equity-backed buyouts was tracked between 1995 and the start of 2010, and compared to a matched sample
of private companies, non-PE-backed buy-outs and listed companies.
Table 1 shows that of the matched sample
, there was a flow of 130 thousand persons from the not in the labour force state to unemployment from March 2010 to April 2010.
Australian psychiatrists from the University of New South Wales, in Sydney, compared the characteristics of 42 patients who had killed strangers with a matched sample
who killed family members.