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The power (and indeed in some cases validity) of a survival analysis is related to the number of events rather than the number of participants.
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33 Validation studies have shown that the Swedish hospital discharge register has a case validity of 95% for a primary diagnosis of HF 32 and a case validity of 98% for AF.
Others might think of validity as involving are more fine grained hyperintensional notion, but in any case, validity so understood is not what logic is concerned with.
In the former case, validity can be confirmed before resources are committed to the main study; otherwise, the latter method conserves resources by not requiring additional participants.
We also restricted our sample to histologically verified cases, which enhanced case validity and allowed us to perform analyses on subtypes of glioma.
Similar to McLaughlin and coworkers [ 10], we believe that either technique could be used, but that in this case greater face validity is provided by the multiplication technique.
In terms of diagnoses we relied -except in the referred cases- on the face validity of the GPs' diagnostic label.
In most cases, relative validity has been proved, but this was not necessarily the case for absolute validity.
Information on case retrieval, validity, and ascertainment of cases in the MDCS has been described in detail previously [ 23].
Analyses of two classical cases demonstrate validity of the new formalism.
The good correspondence between calculated and experimental values indicated in both cases the validity of the generated statistical models for the prediction of microsphere encapsulation efficiency.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com