Can sample size in qualitative research be determined a priori?

DOES SAMPLE SIzE MATTER IN QUALITATIVE RESEARCH?: A REVIEW OF QUALITATIVE INTERVIEWS IN IS RESEARCH

This study examines 83 IS qualitative studies in leading IS journals for the following purposes: (a) identifying the extent to which IS qualitative studies employ best practices of justifying sample size; (b) identifying optimal ranges of interviews for various types of qualitative research; and (c) identifying the extent to which cultural factors (such as journal of publication, number of auth...

Qualitative research sample design and sample size: resolving and unresolved issues and inferential imperatives.

Can optimized effective potentials be determined uniquely?

Local ~multiplicative! effective exchange potentials obtained from the linear-combinationof-atomic-orbital ~LCAO! optimized effective potential ~OEP! method are frequently unrealistic in that they tend to exhibit wrong asymptotic behavior ~although formally they should have the correct asymptotic behavior! and also assume unphysical rapid oscillations around the nuclei. We give an algebraic pro...

Marine microbial diversity: can it be determined?

Estimates of the order of magnitude for the total number of microbial species on Earth range from 10(3) to 10(9). Despite global dispersal of microorganisms, this number is probably rather large. The total biodiversity of an ecosystem is composed of two elements: first, a set of abundant taxa that carry out most ecosystem functions, grow actively and suffer intense losses through predation and ...

Sample Size Calculation: Inaccurate A Priori Assumptions for Nuisance Parameters Can Greatly Affect the Power of a Randomized Controlled Trial

We aimed to examine the extent to which inaccurate assumptions for nuisance parameters used to calculate sample size can affect the power of a randomized controlled trial (RCT). In a simulation study, we separately considered an RCT with continuous, dichotomous or time-to-event outcomes, with associated nuisance parameters of standard deviation, success rate in the control group and survival ra...