V is now the value of a reinforcer delivered after a variable delay, where there are n different possible delays to reinforcement. Pi is the probability that a delay of Di seconds will occur on any given trial. Mazur (1984) obtained fairly good predictions if K was set equal to 1, and this value of K will be used throughout this paper. To see how this model can be used to make specific predicti...

OBJECTIVE To evaluate completeness of reporting of cases of AIDS to the Communicable Disease Surveillance Centre (CDSC) between 1982-1991. SETTING Southside of the Bloomsbury and Islington District Health Authority. DESIGN Reconciliation exercise with CDSC of cases reported with those known to have received treatment in the district from 1982 to March 1990. Case note review of unreported ca...

supplement vol. 2, no.11 & 12, march-june 1998

D a t a s o u r c e s Studies were identified by searching the Cochrane Library (2001, issue 1), MEDLINE (1966 to February 2001), EMBASE/ Excerpta Medica (1980 to March 2001), HealthStar (1975 to March 2001), CINAHL (1982 to Jan 2001), BIOSIS (1985 to March 2001), CAB abstracts (1973 to March 2001), and 4 databases of registered trials; hand searching 8 nutrition journals; scanning bibliographi...

CHEST,81: 3, MARCH,1982 pump oxygenators. Ann Thorac Surg 1980; 29:336 2 Pierce EC II. Specific therapy for arterial air embolism (edictorial). Ann Thorac Surg 1980; 29:300 3 Mills NL, Ochsner JL. Massive air embolism during cardiopulmonary bypass : cause, prevention and management. J Thorac Cardiovasc Surg 1980; 80:708 4 Coss CM. Gray’s anatomy (27th ed). Philadelphia: Lea & Febiger, 1959, Fig...

OBJECTIVE To use a case-control study to analyze risk factors associated with teenage childbearing among adolescents who were in a birth cohort study that began in 1982 in the city of Pelotas, Rio Grande do Sul, Brazil. METHODS Adolescent mothers in Pelotas who gave birth between January 1995 and March 2001 and who had been born in 1982 were identified through the local birth information syst...