The authors say: «It is possible that either AET, RT or CT may be easier to perform effectively without supervision, thus affecting
the external validity of these results since only studies with supervised training were included.»
These selection criteria may have consequences for
the external validity of our results.
While this is appropriate when treatment effects are being examined initially, it can restrict
the external validity of the results, i.e., how well results can be extended to the patients in clinic situations.
Not exact matches
Even ignoring this failure
of external validity, the reported
results from Abecedarian favoring the treatment participants are in doubt because the evaluation
of Abecedarian's impacts on participants is seriously compromised by a large imbalance in decline - to - participate rates by those assigned to the treatment vs. the control condition; and by the presence in the treatment group
of an appreciable proportion children who were not randomized into the condition.
The
results of the three studies confirm that the life goal questionnaire GOALS possesses high internal und
external validity.
The
results support the consistency
of both tasks and scales, the discriminant properties,
external validity and fidelity
of the coding system.