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Randomized encouragement trial is the clinical trials in which the participants are encouraged to change their behaviour in a particular manner (or not, if they are allocated to the control condition) but there is a little expectation on the behalf of the trial investigators that the participants will fully comply with the request or that there will not be the substantial minority who change their behaviour in the desired way without actually being asked (by trial investigators, at least) to do so. An instance includes randomizing expectant mothers (who are cigarette smokers) to receive the advice to cut down on or completely stop smoking during the pregnancy period. Number of the mothers will fail to reduce their smoking habits even though they have received sufficient encouragement to do so. On the other hand, number of them will cut down whether or not they have received the advice suggesting that they should stop smoking. Randomized encouragement to take part in the cancer screening programmes is another example of it. Again, adherence to the offer of screening will be far from the complete, but, on the other hand, there will always be people who will ask for examination in any case
A subject who withdraws from the study for whatever reason, adverse side effects, noncompliance, moving away from the district, etc. In number of cases the reason may not be known.
Reinterviewing is the second interview for a sample of survey respondents in which questions of the original interview (or the subset of them) are repeated again. The same methods
Growth curve analysis is t he general term for methods dealing with development of the individuals over time. A classic instance includes recordings made on a group of children, sa
Minimization is the method or technique for allocating patients to the treatments in clinical trials which is usually the acceptable alternative to random allocation. The procedur
CONSTRUCTION OF AN OR MODEL
Mean-range plot is the graphical tool or device useful in selecting a transformation in the time series analysis. The range is plotted against the mean for each of the seasona
Wilcoxon's ranksum test is the distribution free method or technique used as an alternative to the Student's t-test for assessing whether two populations have the same location. G
Paired availability design is a design which can lessen selection bias in the situations where it is not possible to use random allocation of the subjects to treatments. The desig
Non-randomized clinical trial is the clinical trial in which the series of consecutive patients receive a new treatment and those which respond (according to some of the pre-defin
Omitted covariates is a term generally found in the connection with regression modelling, where the model has been incompletely specified by not including significant covariates.
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