Release History
The table below lists the improvements and bug fixes of the last DataLab versions. The latest release can
be loaded from the download page.
| Release 3.000 [2011-Dec-11] |
Neue Features
- partial least squares (PLS) regression model
- data imputation techniques
Improvements
- user interface has been adjusted to comply with Windows 7
- DataLab now fully supports the Windows multiple document interface
- MLR windows additionally displays regression coefficients as a graph
- Fourier transform improved
- Wilcoxon signed rank test for paired samples implemented
- ANOVA now performs Levene's test in parallel
- the data editor now accepts both integer ordinals and categorial identifiers for categorial variables
- the data editor now supports inserting and deleting rows and columns
- the clustering window uses new dendrogram layout and provides an improved user interface
- the script commands "CloseAllCharts", "ScaleCols", "ScaleRows" and "Sort"
- the script command Chart[x].KindOfDisp supports now probability plots and cumulative distributions
- the math formula interpreter is now capable of calculating the sum, the mean, and the variancew
- update engine improved, automatic checking for updates implemented
- correlation function is now calculated for both positive and negative shifts
- matrix view now indicates single empty cells even in very large data matrices
- user interface and calculation speed of variable selection improved
- PCA and PCR user interface stream-lined
- PCR now calculates regression coefficients to original data, as well
- explanation part in test protocols improved
- variable selection with MLR does no longer include VIFs if there are more variables than objects
- 3D surface plot extended and improved
- various minor improvements and adjustments
Bug Fixes
- MLR: t-value of intercept was always 0.0
- KS-Test: KS-value was slightly off under certain circumstances
- selection field of univariate statistics dialog did not adapt to changes of the variable identifiers
- PCA component selection in one plot produced side effects in other PCA plots
- curve fitting does no longer crash with very small or very large numbers (< 1e-100 or > 1e100)
- sign of t-value of matched pairs test is now displayed correctly
- missing translation of 3D surface plot fixed
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| Release 2.700 [2010-Mar-09] |
New Features
- multi-document interface (MDI) for most windows implemented
- PCA and PCR support now the selection of variables
- PCA now creates bi-plots as well
- plots of ordinal and nominal variables may be blurred to see how many points are on top of each other
- univ. regression: Hoerl function implemented
- symbol assignment to classes implemented
Improvements
- user interface of univariate descriptors, simple linear regression, MLR, PCA, PCR and cluster analysis improved
- command "clear clipboard" implemented
- plot window now offers additional buttons
- data can be marked and deleted in univariate regression dialog
- univariate regression: cursor now snaps to objects and displays coordinates and object name
- univ. regression: residuals can be copied to matrix clipboard
- univ. regression: Durbin-Watson test statistic is now calculated
- matrix viewer can now be minimized
- math formulas can now be applied to marked data (keyword MARKED)
- dialog window for marking data replaced by numerical editor
- script editor and comment editor are now separate editors
- filter command now fills column/row headings with info about filter, starting and ending cells are marked as empty
- the command "digitize" now writes calibration data into the comment of the data matrix
- multiple regression: cursor now snaps to objects in residual plots and displays coordinates and object name
- OK and Cancel buttons are no longer redundant on various forms
Bug Fixes
- script command "initialize" did not clear the comment field
- loading big ASC files does not take eons any more
- stepwise regression does no longer crash when the number of selected variables approaches the number of objects
- fixes of several minor bugs
- old PCA info box displayed wrong PCA scores (although they were calculated correctly in all other parts of DataLab)
- copy marked rows to matrix clipboard now works as expected
- residuals in univariate regression window showed wrong sign
- captions of regression and residual chart are now correct
- ANOVA of reciprocal function in univariate regression is now correct
- matrix viewer window now accepts auto-advance when entering column names
- communication between plot and regression windows improved
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| Release < 2.700 |
| Release history of versions before release 2.700 has been deleted for brevity |
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