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Biostatistics Knowledge Center

Educational articles on statistical methods, SPSS usage, and academic research.

Sample Size for Correlation Coefficient (Relationship)

It is used to examine the relationship between clinical variables and scales, and between clinical variables and measurements such as age and operation duration.

4/14/2026

10 min

Sample Size

Determining Sample Size in Prevalence Studies

Prevalence refers to the frequency with which a disease or event occurs in a population. It is usually obtained from cross-sectional studies.

4/14/2026

10 min

Advanced Statistics

G*Power Analysis for Two Dependent Group Measurement

We will focus on how to conduct power analysis for research aiming to test differences between pre- and post-treatment measurements.

4/14/2026

10 min

SPSS

Downloading the SPSS Program

We're talking about ways to download the SPSS program for free.

4/14/2026

10 min

G*Power

What is Survival Analysis? Kaplan-Meier and Cox Regression

We explain the basic concepts of survival analysis, Kaplan-Meier curves and Cox proportional hazard model.

4/14/2026

12 min