# Fragility Index Calculator — Are these results robust?

> Tool to assess statistical robustness of trial results using Fragility Index. (iPhone/iPad app by Ernie Yap.)

- Source: https://appshunter.io/ios/app/fragility-index-calculator/id6744300161 (this page in markdown: same URL + `.md`)
- Developer: [Ernie Yap](https://appshunter.io/developer/1806950808)
- Category: Medical, Education
- Price: Free
- Rating: 5.00/5 from 4 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.2 · 4 MB
- Languages: English
- Released: 2025-04-08
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/fragility-index-calculator/id6744300161/reviews.md

## What is Fragility Index Calculator?

This tool helps clinicians and researchers assess the statistical robustness of trial results using the Fragility Index, based on the method by Walsh et al. (J Clin Epidemiol, 2014). By simulating event shifts and recalculating p-values via Fisher's Exact Test, it identifies how sensitive a study's significance is to small data changes.

## Key features

- Assess statistical robustness of trial results
- Simulate event shifts
- Recalculate p-values
- Identify sensitivity to data changes
- Based on Walsh et al. method

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/fragility-index-calculator/id6744300161/reviews.md

### 5/5 — Very happy!

*2025-04-12*

Excellent app! Great for discussing and planning!

## Frequently asked questions about Fragility Index Calculator

### What is the Fragility Index Calculator used for?

The Fragility Index Calculator helps clinicians and researchers assess the statistical robustness of trial results. It identifies how sensitive a study's significance is to small data changes by simulating event shifts and recalculating p-values.

### What method is the Fragility Index Calculator based on?

The app is based on the method by Walsh et al., published in the Journal of Clinical Epidemiology in 2014. This provides a scientifically grounded approach to assessing result fragility.

### How does the Fragility Index Calculator work?

It works by simulating event shifts within a dataset and then recalculating p-values using Fisher's Exact Test. This process helps determine how many events would need to shift to alter the statistical significance of the results.

### Is the Fragility Index Calculator free to use?

Yes, the Fragility Index Calculator is available for free. There are no costs associated with downloading or using its features.

### What devices does the Fragility Index Calculator support?

The Fragility Index Calculator currently supports iPhone devices. It is optimized for the iOS platform.

### When was the Fragility Index Calculator last updated?

The Fragility Index Calculator was last updated on April 8, 2025, with version 1.0. This indicates it is a recent release.

### What is the age rating for the Fragility Index Calculator?

The Fragility Index Calculator has an age rating of 4+. This means it is suitable for users of all ages, with no content restrictions.

### Does the Fragility Index Calculator have ads?

No, the Fragility Index Calculator does not contain advertisements. Users can utilize its features without interruption.

## Version history (last 1 release)

### 1.0 — 2025-04-08

No release notes.

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## More apps by Ernie Yap

- [Credit Card Usage Tracker](https://appshunter.io/ios/app/credit-card-usage-tracker/id6755962975)
- [Ionized Calcium Calculator](https://appshunter.io/ios/app/ionized-calcium-calculator/id6756215675)

All apps by Ernie Yap: https://appshunter.io/developer/1806950808

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*