n4Studies Plus
Chetta Ngamjarus
Ease to calculate the sample size with n4Studies Plus.
Regional download prices
Latest verified download price in each collected storefront. Open a row to verify the current price on Apple.
| Storefront | Download price | Currency | Observed | Official store |
|---|---|---|---|---|
| THThailand | ฿299.00 | THB | Aug 3, 2026 | View Apple price ↗ |
| USUnited StatesCurrent storefront | $7.99 | USD | Aug 3, 2026 | View Apple price ↗ |
In-app purchases in United States
Items currently visible on Apple’s public App Store page. This may not be the complete App Store Connect catalog.
Source: Apple public App Store page · Publicly visible items only · Checked Aug 3, 2026
About n4Studies PlusStorefront description supplied by Apple.
Ease to calculate the sample size with n4Studies Plus.
n4Studies Plus makes it easy to calculate the sample size and the power of a study in various study designs. It comes with ABSOLUTELY NO WARRANTY. However, It can be helped to learn and find the ways to calculate the sample size and power of the study in minutes.
Key features:
• Calculate the sample size for simple and multiple linear regression, logistic regression
• Calculate the sample size for survival analysis e.g. compare 2 survival curves, compare for equality between 2 hazard rates etc.
• Calculate the sample size for diagnostic study, cross-over study
• Calculate the sample size for estimating an infinite population mean, finite population mean, infinite population proportion and finite population proportion
• Calculate the sample size for comparing two population means and two population proportions
• Calculate the sample size for the Case-Control for study, Matched Case-Control study, Cohort study, Randomized Controlled Trial, Non-inferiority trial and Equivalence trial
• Calculate the power of a study for comparing two population means and two population proportions
• Calculate the power of a study for the Case-Control for study, Matched Case-Control study, Cohort study, Randomized Controlled Trial, Non-inferiority trial and Equivalence trial
• Sample size and power calculations for measures of Agreement (both Kappa statistic and Intraclass correlation coefficients)
• You can send a output via Email to your colleagues
Frequently asked questions
Quick answers based on the latest observed App Store data.
How much does n4Studies Plus cost in United States?
The latest observed download price is $7.99. Open the official App Store link to confirm the current checkout price.
Does n4Studies Plus have in-app purchases?
Apple's public page currently shows 0 purchase items in this storefront. The public list may be incomplete.
Can the price differ by country?
Yes. App Store prices can vary by storefront, currency, taxes, and developer pricing. We currently have 2 regional observations.