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I will calculate sample size or power for your research
Clinical Research and Biostatistics Expert, SPSS, R, Stata
PhD in Forensic Medicine & Clinical Toxicology with expertise in biostatistics, clinical research, and medical data analysis. Author of 10+ indexed publications. I provide statistical analysis, study ...
About this Gig
Need a statistically justified sample size for your medical study, clinical trial, or academic research?
An improper sample size is a leading cause of protocol and manuscript rejection. As an academic researcher and medical biostatistician with over 20 years of experience in scientific publishing, I will ensure your study is built on a flawless, reproducible mathematical foundation.
Using advanced software (G*Power, R, Stata), I calculate the exact sample size needed to achieve your target statistical power while strictly adhering to international peer-review and IRB standards.
What I compute for your study:
- Proportions & Means: Surveys, $t$-tests, Chi-square.
- Advanced Designs: ANOVA, Repeated Measures, ANCOVA.
- Regressions: Linear, Logistic, Cox Proportional Hazards.
- Diagnostic Accuracy Studies: Sensitivity, Specificity, and ROC Curve analysis.
What you will receive:
- Exact Sample Size (N): Broken down clearly by cohorts or study arms.
- Publication-Ready Text: A professionally written justification paragraph in academic English detailing your parameters (Effect size, alpha, beta) and citations.
- Power Curve Plot (Standard/Premium tiers).
My Portfolio
FAQ
What information do I need to provide to get started?
You need to share your study design, primary objective, and type of outcome variable (e.g., continuous or categorical). Providing a reference article or pilot study showing expected means, percentages, or standard deviations is highly recommended to determine the expected effect size
Which statistical software packages do you use for power analysis?
I primarily perform calculations using G*Power, RStudio, and Stata. The choice of software depends entirely on the complexity of your specific study design, ensuring that the formulas and methodologies applied are universally accepted by IRB boards and scientific journals.
Will the methodology text be ready to include in my protocol or manuscript?
Yes, absolutely. I provide a professionally written Sample Size Justification paragraph in formal academic English. It will explicitly state your study parameters (Effect size, alpha, power, drop-out adjustments) and include formal software citations, ready for your IRB or journal submission.
