Search results
Results from the WOW.Com Content Network
An important variant of the external validity problem deals with selection bias, also known as sampling bias—that is, bias created when studies are conducted on non-representative samples of the intended population. For example, if a clinical trial is conducted on college students, an investigator may wish to know whether the results ...
E.g. a scale that is 5 pounds off is reliable but not valid. A test cannot be valid unless it is reliable. Validity is also dependent on the measurement measuring what it was designed to measure, and not something else instead. [6] Validity (similar to reliability) is a relative concept; validity is not an all-or-nothing idea.
Ecological validity, the ability to generalize study findings to the real world, is a subcategory of external validity. [ 6 ] Another example highlighting the differences between these terms is from an experiment that studied pointing [ 7 ] —a trait originally attributed uniquely to humans—in captive chimpanzees.
There are five key principles relating to internal validity (study design) and external validity (generalizability) which rigorous impact evaluations should address: confounding factors, selection bias, spillover effects, contamination, and impact heterogeneity. [5]
Conducting field experiments allows researchers to make causal inferences from their results, and therefore increases external validity. However, confounding may decrease internal validity of a study, and ethical issues may arise in studies involving high-risk. [2]
There are some Christmas traditions in England that might confuse people from the US.. Some folks in the UK celebrate Christmas with pantomime, a campy, family-friendly theater show. Christmas ...
Reliability does not imply validity. That is, a reliable measure that is measuring something consistently is not necessarily measuring what you want to be measured. For example, while there are many reliable tests of specific abilities, not all of them would be valid for predicting, say, job performance.
White Elephant, Dirty Santa, Yankee Swap. It's the Christmas gift exchange that goes by a hundred names, with thousands of different rules that vary family to family.