StatPlus Statistics & Analysis vs Line

StatPlus allows iOS users to perform various methods of data analysis from the basic to complex analysis, including non-parametric analysis, ANOVA (with post-hoc tests), regression analysis (includes residuals analysis, heteroscedasticity tests, collinearity diagnostics), survival analysis (probit analysis and LD50 calculation, ROC curves analysis and comparison, life tables and Kaplan-Meier), time series analysis (autocorrelation function analysis, unit root tests), quality control (capability analysis, control charts) and other methods and visualizations. No matter if you are an experienced user migrating from a familiar toolset or a novice exploring the capabilities of the new software on iOS, StatPlus gives you a workspace with a vast array of tools. DATA SOURCES Supported formats for import (data and formatting only): ◦ Microsoft Excel ".XLSX" and ".XLS", ◦ OpenOffice/LibreOffice ".ODS" documents, ◦ Text files - comma-separated values ".CSV" and tab-delimited ".TXT"/".TSV"/".TAB". EXPORT REPORTS AND CHARTS ◦ Reports can be exported as Microsoft Excel documents (charts are supported). ◦ iPad version supports basic chart customizations. ◦ You can also copy a chart as PNG image to any iOS app. SUBSCRIPTIONS ◦ Free. Even the free tier tools (no paid subscription required) demonstrate qualities typically only available in costly specialized suites – consistency and accuracy of results and reliability. Limited to 250 cases per variable (column). Includes all Excel Analysis Toolpak (Excel ATP) methods with additional options/features. ◦ Pro subscription ("Pro") is an annual (12 months) or monthly subscription that includes over 50 analysis methods, particularly all basic statistics, ANOVA and regression commands, charts and quality control tools. Also includes ability to export reports. ◦ Premium subscription ("Premium") is an annual (12 months) or monthly subscription that combines all the Pro subscription features with advanced features, including all time series and survival analysis methods. Paid subscription will be charged to iTunes Account at confirmation of purchase. The subscription will automatically renew unless cancelled at least 24 hours before the end of the current period. Subscription may be managed and auto-renewal disabled via your App Store Account Settings after the purchase. Once purchased, the subscription cannot be cancelled during the active subscription period. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable.

The Line-Fit app uses linear regression to model the relationship between two variables (x and y) by fitting a linear equation to observed data. One variable is considered to be an explanatory (independent) variable, and the other is considered to be a response (dependent) variable. A linear regression line has an equation of the form Y = a + bX, where X is the explanatory variable and Y is the dependent variable. The slope of the line is b, and the intercept is a (the value of y when x = 0). To measure the association between the two variables the correlation coefficient is used, which is a value between -1 and 1 indicating the strength of the association of the observed data for the two variables. The coefficient of determination, R2, measures how close the data are to the fitted regression line. In general, higher values of R2 indicate a better fit of the model to the given data. R2 is always positive and equal to 1.0 for a perfect fit.