Critics noted that the system inherently fostered selection bias, and therefore lacked both internal validity and external validity.
12.
There is a thing called internal validity that measures how a term is used by different people at different times.
13.
After item creation, initial items are selected or eliminated based upon which will result in the strongest internal validity for each scale.
14.
The random sampling and quasi control groups that Deliberative Polling employs, in comparison, have a higher degree of external and internal validity.
15.
In order to allow for inferences with a high degree of internal validity, precautions may be taken during the design of the scientific study.
16.
There is usually a trade-off between experimental control ( internal validity ) and being able to generalize to the population ( external validity ).
17.
While gaining internal validity ( excluding interfering variables by keeping them constant ) you lose ecological or external validity because you establish an artificial laboratory setting.
18.
Social psychologists opt first for internal validity, conducting laboratory experiments in which people are randomly assigned to different conditions and all extraneous variables are controlled.
19.
Internal validity of case series studies is usually very low, due to the lack of a comparator group exposed to the same array of intervening variables.
20.
Studies have been conducted to test the internal validity of web-based experiments, comparing across experimental conditions ( online and offline ) and successfully replicating findings.
