Recently iPhone Apps

Biostats Calculator von Sam McCall

// Dezember 21st, 2009 // Medizin

Biostats Calculator Version: 1.0.2 Größe: 0.4 MB Preise: € 7.99 Rating: 4+

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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* 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 ratiosFuture updates to the application will be free to all users.

© 2009 Sam McCall

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