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I will calculate sample size and power for your research study
Research Data Analyst for Life Sciences R and SPSS
Hi, I’m Hidayat, a researcher with an MS in Molecular Biology and a data analyst specializing in biological and health sciences. I help researchers, students, and healthcare professionals turn raw dat...
About this Gig
Planning a study or writing a research proposal? I'm Hidayat, a molecular biologist (MS Molecular Biology) and biostatistician. I calculate the right sample size for your study, so it has enough power to detect real effects without wasting time or resources.
What I calculate:
Sample size for t-tests, ANOVA and chi-square
Correlation and regression studies
Cross-sectional surveys (prevalence-based)
Clinical trials, cohort and case-control studies
Lab and animal experiments
Post-hoc power for completed studies
You get:
Correct method for your study design
Exact sample size with dropout adjustment
A ready justification paragraph for your methods section
G*Power or R output and power curves as evidence
Tools: G*Power, R and SPSS
Please message me before ordering with your study design, main outcome and any values from previous studies.
FAQ
What information do you need?
Your study design, main outcome, number of groups, and any effect size, mean/SD or prevalence from previous studies. If you don’t have these, I can help you find reasonable values from the literature.
What if I don’t know my effect size?
I’ll help you choose a justified value based on similar published studies or standard conventions, and explain the choice.
Can you calculate power for a study I already finished?
Yes. I can run a post-hoc power analysis based on your sample size and results.
Will the result be accepted by my ethics committee?
I provide the full calculation, assumptions and a justification paragraph that ethics committees and reviewers usually expect.
Which software do you use?
G*Power and R, with outputs you can attach to your proposal.
