To ensure comparability over time, the comparative analysis was restricted to four provinces covered by all three surveys (Banteay Meanchey, Battambang, Sihanouk Ville, and Phnom Penh) and Kampong Cham province, which was covered by the 2001 and 2005 surveys.
We rescaled data in this way to ensure comparability across time periods (that is, using the same reference point across time).
The lack of a sound basis for measurement comparability across time jeopardizes a major design component of the NHANES, that of time-trend analyses.
This change made the endline questionnaire comparable to other countries, but may have affected internal comparability over time.
To ensure maximum comparability over time, we identified major causes of death using comparable ICD-9 and ICD-10 codes as recommended by the US Centers for Disease Control.
Here, we shall use Visser's (2013) pioneering attempt to achieve comparability across time and countries of key institutional features as an organizing device on which to hang some more recent research, specifically controversies/findings on collective bargaining coverage under extension agreements, the costs of those agreements, and the impact of contract innovation under decentralization.
The ongoing Immigration Policy and Law Analysis project (IMPALA, see http://www.impaladatabase.org/) seeks to achieve policy comparability across time and space by providing a measurement of migration policies over the 1960 2010 period for 25 immigration countries, again across pre-defined policy indicators (Gest et al. 2014).
Year and mortality coding system (International Classification of Disease ICDD) version) were included to enhance outcome comparability over time.
In addition, practices were selected based on comparability over time and across countries and the mother's ability to respond.
Provisions will be needed for incorporating such advances into routine dataset annotation while still achieving comparability through time.
