8.2.1
2023-08-13
- Fixed bug that prevented app output from being shared from the iPad.
8.2
2023-08-06
- Minor change to graph engine CorePlot.
8.1
2023-05-10
- Updated graph to CorePlot version 2.4
- GUI changes
8.0
2019-12-23
- Redesign and reworking of GUI.
- Code changes to accommodate iOS 13.
- Removed links to Facebook and Twitter.
- Audio feedback when various objects are touched.
- Changed most decimal precision from single (float) to double.
7.5
2016-11-30
- Code tweaks to accommodate iOS 10.
7.4
2016-06-14
- Changed button action from "Touch Up Inside" to "Touch Down" for quicker performance.
- Code changes for simplification and improvement in logic.
7.3
2015-09-30
- Changes to adapt to iOS 9, mostly involving fonts.
7.2
2015-05-21
- New icons for buttons and other controls.
- In iPhone version, double arrows increment or decrement repeatedly if the touch down is held.
- Redesigned the app logo.
- Updated the Facebook link syntax.
7.1
2015-01-10
- Consolidated PDF report sharing options
- Added AirDrop as a report sharing option
- Added Facebook and Twitter posting
7.0
2014-10-05
- By convention, linear regression is expressed as Y = function(X) where Y is the dependent variable and X is the independent variable. The iPad version now allows expressing the linear regression as X = function(Y) as an option.
- Also, in the iPad version, you may estimate the dependent variable amount by entering an estimate of the independent variable.
- Minor GUI tweaks.
- Updated for iOS 8 and iPhone 6.
6.2
2014-06-12
- Bug fix affecting computation of numerically small X-Y pairs.
- Added correlation coefficient.
- Bug fix affecting iPhone version when loading the first Y value from the stored data with the slider input option.
6.1
2014-02-26
- Fixed bug that prevented adding a new data file without exiting app.
6.0
2014-02-12
- iPad version now adds email, text message, and print capability. A PDF report at a resolution of 72 dpi is available for sharing.
- Minor bug fix involving GUI interface.
5.0
2013-12-11
- Rewritten and redesigned for iOS 7.
- Added warning to prevent inadvertent resetting of all data in both iPhone and iPad versions.
- GUI enhancements.
4.0
2013-08-15
- Major revision that includes the option of adding data sets, retrieving saved sets, and deleting or reordering the saved sets.
3.3
2013-03-28
- In iPad version, the behavior of the "info" and "clear" buttons have been modified to avoid unanticipated behaviors. Also, crashes resulting from touching the "+/-" button when the keyboard was displayed have been eliminated.
- Clearing data now works properly.
3.2
2013-02-26
- Streamlined source code for improved performance.
3.1
2013-02-07
- Added a +/- stepper for adjusting number of pairs to regress.
- Bug fix for iOS 5.
- Minor GUI changes.
3.0
2013-01-24
- Quick Linear Regression is now a Universal app.
- The iPad version allows selection of the number of X-Y pairs to be regressed between 3 and 20.
- The iPhone version modifies the way data entry fields are cleared by putting a "Clear" button above the numeric keypad.
2.3
2012-10-10
- To simplify moving between the two methods of data entry, we have added buttons for "Keypad" and "Slider" in the lower right-hand corner of the data entry views.
- On the 'Extended Regression' view, we added a reminder that a data entry of zero is a number, but a blank data entry is an 'n/a' that removes the x-y pair from the regression computation.
2.2
2012-09-26
- Never mind. Removed upside-down portrait mode that caused display issues when editing.
- Modified syntax of iTunes App Store link.
2.1
2012-08-27
- Added ability to create values with zero to three decimal place precision in the 'Keypad Input' screen and changed the way that numbers are assigned plus or minus signs.
- Extended the number of x-y pairs from 18 to 20 in the 'Keypad Input' screen.
- In 'Keypad Input', removing a data entry with the 'n/a' description is accomplished by making the entry blank.
- Improved floating point precision of all calculations from single to double.
- Minor GUI changes.
2.0
2012-04-09
- Added new page for 'keypad' data entry beyond the -1000 to +1000 numerical limits of the 'slider' data entry
- Added 'Previous Item' button on slider data entry view for backward movement among data entry fields
- Various display modifications