Here is the CMT Uptime check phrase
News
Events
Blog
Give
Publications
Software
Contact
About
People
Research
Services
Education
PUBLICATIONS
Estimation for Volunteer Panel Web Surveys Using Propensity Score Adjustment and Calibration Adjustment
Lee, Sunghee
;
Valliant, Richard L
. (2009).
Estimation for Volunteer Panel Web Surveys Using Propensity Score Adjustment and Calibration Adjustment
. Sociological Methods & Research. 37(3), 319-343.