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Biostats Calculator

Biostats Calculator
  • #: 201429
  • Price: $9.99 In Apple Store
  • Category: Medical
  • Updated: 2010-12-07
  • Current Version: 1.3.1
  • 1.3.1 (iOS 4.0 Tested)
  • Size: 0.90 MB
  • Language: English
  • Seller: Sam McCall
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 3.0 or later
  • © 2010 Sam McCall
  •  Add to Favorite apps

 

Description

Biostats Calculator provides a comprehensive collection of biostatistical calculations. It is designed to provide easy access to the most common tests without resorting to a complex desktop statistics package. It also includes a sample size calculator for epidemiological studies, and can measure the utility and power of diagnostic tests.

Every test comes with a description, explaining when the test is applicable, an explanation on how to enter any required data, and a guide to interpreting the results. Interactive balloon help is also available, giving descriptions of technical terms.

= Available tests and calculations =

All tests generate p values indicating the significance levels of their results, as well as the listed statistics.

* Odds ratio

- confidence intervals

* Relative risk

- confidence intervals

- number needed to treat

* Chi-squared and Fisher exact tests

- enter any number of groups

- automatic test selection based on sample size

- chi-squared statistic

* Unpaired t-test

- enter data individually or as summary statistics

- confidence intervals for difference in means

- t statistic

* Mann-Whitney U test

- U statistic

* One-way ANOVA test

- F statistic

* Paired t-test

- confidence intervals for mean difference

- t statistic

* Wilcoxon signed-rank test

- W+ and W- statistics

* Pearson correlation

- correlation coefficient

- determination coefficient

* Spearman rank correlation

- correlation coefficient

* Sample size calculator

- enter Type I and Type II error rates (alpha and beta)

- allows unequal group sizes to be specified

- study can measure dichotomous variables (difference in proportions) or continuous variables (difference in means)

- required size of each group, and total size

* Diagnostic test utility

- specificity

- sensitivity

- false positive rate, false negative rate

- positive and negative predictive value

- positive and negative likelihood ratios

Future updates to the application will be free to all users.

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Rated 5/5 based on 1 customer reviews.

 

5/5 stars

Excellent for sample size calculations

:
While other reviews have been critical because of lack of decimal points, I purchased this app - as a clinical researcher- solely for sample size calculations (where decimal point valued are not needed). Less expensive sample size apps calculated sample size only based on mean differences between groups. I was looking for an app with the additional ability to calculate sample sizes based on proportion differences between groups. This app has both features and performed excellently.

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The information may be outdated (2011-04-25 06:36:38). For actual information go to iTunes

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