Science of Neurosurgical Practice-Calculating Sample Size

Video Transcription

Video Summary

In this video, the speaker discusses the importance of determining the sample size when conducting a study. They explain that it is not feasible to test an entire population, so a sample is chosen to represent the larger population. The goal is to obtain a sufficient number of participants to test the study hypothesis and reach conclusions that can be generalized to the population. The challenge is to balance efficiency by not wasting resources with obtaining a large enough sample size. Factors that determine sample size include the significance level, power, expected prevalence of factors of interest, test efficiency, and the design of the study. The speaker provides examples and formulas to calculate sample size for different scenarios, including qualitative and quantitative data. Additionally, they recommend using software called G-Star Power to simplify the calculation.

Asset Subtitle

Presented by Elias B. Rizk, MD, MS, FAANS

Keywords

sample size

study

population

hypothesis

generalization