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DataLab
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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. Please note that updates which are not yet part of the last major release can be activated by using the automatic update mechanism (see also the list of the latest changes).
 
Release 3.530 [2013-11-18]

New Features

Improvements and Changes

Bug Fixes

  • cross validation of PLS models with more than 15 target variables resulted in range error
  • correlation function: reentrancy problems fixed
  • Spearman's rank correlation delivered wrong results for large data sets (>50000 values)
  • univariate descriptors showed floating point error on empty data matrix
  • F-Test: incorrect degrees of freedom were calculated if the variance of the blue group was larger than the variance of the red group
  • reg. license was not recognized correctly in some special cases
  • "Revert" command did not revert the comment displayed in the matrix viewer

 

Release 3.511 [2013-03-16]

Bug Fixes

  • the link into the help page of the 2D data designer was invalid
  • the symbol table did no show any symbols

 

Release 3.510 [2013-03-15]

New Features

Improvements and Changes

  • PCR window provides now a context menu for the various charts
  • speed of cross correlation function increased
  • the calculation of filtered data can now be restricted to a particular range of the data matrix
  • displaying speed of charts with a huge number of data points (as symbols) is increased by a factor of 10
  • import of CSV data provides now a progress feedback
  • speed of loading data files improved
  • a warning is displayed if the user opens an IDT file which is newer than the current version of DataLab
  • serialisation of data matrices now includes the column and row index of the original data
  • 3D surface plot offers now two types of interpolation
  • MLR of large data sets is now much faster

Bug Fixes

  • rowwise filtering of data did not write the results back to source matrix
  • various minor bug fixes
  • plot window displayed error message if one of the variables of a bivariate plot was empty
  • new windows are now positioned correctly in a multi-monitor environment
  • text import filter: overreading intial lines now works even if trigger is empty

 

Release 3.506 [2013-01-07]

New Features

Improvements and Changes

  • the dialog for selecting the working directory has been improved
  • double-clicking the data plot switches to a list of the most important statistical parameters
  • XLS import routine now recognizes categorial columns automatically and allows to specify date/time format for headings
  • image digitization provides now a button to paste an image from the Windows clipboard
  • results of the filter process can now be stored in the matrix clipboard, as well
  • data imputation can now be applied row-wise, as well
  • plot window now offers an option to display date/time coordinates (see diagram options)
  • DataLab now supports the direct import of both Excel XLS and XLSX files
  • MS Sans Serif is replaced by Arial font throughout the program to get more space for labels etc.
  • the data editor now offers three additional button to scroll the spreadsheet
  • the matrix clipboards can now hold up to nine auxiliary matrices (copy of the original + 8 user defined)
  • the original data matrix is now automatically stored in matrix clipboard upon load from disk
  • the work matrix can now be selected from the matrix clipboard
  • data editor now displays the range and number of selected cells
  • random number generator: user defined profiles can now be saved to disk
  • PLS-DA: classification results now display various performance indicators
  • PLS-DA now provides cross validated true-positive- and false-positive rates
  • the DataLab blog (German only) is now integrated into support menu
  • the heading generator now generates month and day names using the DataLab language setting (and not the locale)
  • line and spectral plots now provide the option to indicate the data points
  • the dendrogram can now be displayed as numerical table and in Newick format
  • the help file now offers links to the corresponding pages of the DataLab-Blog (German only)
  • filter command can now be applied to several columns or rows and offers additional features (smoothed second derivative acc. to Savitzky-Golay, selection of storage mode)
  • script interpreter supports two additional commands ('filtercoeffs' and 'filter')
  • the speed of PLS discriminant analysis with very large data matrices has been increased by 20 to 50%
  • both the variable and the object selector support now the selection of data at regular intervals
  • PLS indicates the progress of a time-consuming calculation in a progress bar
  • help improved

Bug Fixes

  • a missing working directory does not result in a program crash any more
  • cluster analysis crashed if the matrix size has been changed while dendrogram window was open
  • the distances of Ward's method of cluster analysis are now calculated correctly
  • Durbin-Watson test in univariate Regression is now correctly applied (problem with unsorted data)
  • percentiles for vary small samples are now calculated correctly
  • empty cells were set non-empty when copying from the matrix clipboard to the main matrix
  • dendrogram now displays class colors after opening the cluster window
  • communication between data editor and data imputation window did work as expected
  • the final columns were not processed correctly when filtering the data rowwise
  • the level of measurement has been processed incorrectly when deleting marked columns
  • memory overflow fixed (occurred when displaying boxplots of marked data of huge matrices)
  • script commands "markdata" and "unmarkdata" did not process parameter list correctly
  • univariate regression: object indicator now displays correct row name for marked data, as well
  • nominal identifiers are now correctly reset when reading IDT files
  • aborting the update process now provides appropriate feedback
  • marking the data in the test window did not affect the main data matrix
  • refresh of class symbols did not work when assigning different class symbols or class numbers
  • a few minor cosmetic bug fixes
  • import from XLS file: comment is now correctly initialized
  • the logarithmic display of the FFT plot generated a floating point error
  • the background of main window is now drawn correctly even if DataLab spans several screens
  • invoking the correlation function or a statistical test via a script now correctly translates these windows
  • several translation errors in the German version fixed
  • the update dialog created a weird error message if a proxy between the user system and the update server required an authentication
  • changing the option "Use full precision when copying to clipboard" did not have any effect as long as the numeric data editor was open
  • control to set the filter size did now work properly
  • missing refresh message to the other windows after executing a script
  • matrix viewer did not refresh its image when empty state of cells changed
  • histogram of a column/row displayed a prompt to mark the data if the corresponding column/row was empty
  • normal probability plot raised an exception if the number of select data was too low

 

Release 3.500 [2012-Aug-09]

New Features

  • update window now provides a link to a Web page showing the latest changes
  • PLS-discriminant analysis implemented
  • dichotomisation tool implemented
  • new command "Data/Edit/Set to Zero/...." allows to set parts of the data matrix to zero values
  • new command "Create Indicator Variables" supports the generation of binary indicator variables
  • the new command "File/Recently Opened" allows to select from a list of previously opened files

Improvements and Changes

  • the scatter plot window now displays marked data and allows to mark data of both types
  • process communication between various windows improved
  • help file improved
  • markings can now be exchanged using the numerical table editor
  • handling of logarithmic scale labels improved
  • colors of marked data are now adjustable by the user
  • histogram of nominal/ordinal variables now create a point histogram (one variable per bin) if class definition is set to automatic
  • ordinal and nominal scales now show the ordinals in parantheses if no identifiers are defined
  • PCR now has a user interface which resembles the MLR interface and allows to mark data
  • IDT format extended to include range mode of histograms, cumulative frequency plots and normal prob. plots
  • cumulative frequency plots for small data collections are now based on sorted data (and not on the histogram bins)
  • histogram setup now offers an automatic selection of the number of bins
  • cross correlation table now allows to switch between different measures of correlation
  • eyedroppers now invoke variable/object selection dialog; selection via matrix survey plot is no longer available
  • digitisation supports now logarithmic scales as well
  • protocols for the standards tests now display probabilities, as well
  • if two blocks are paired, the tests for normality now also test the differences of two blocks
  • file open/save dialogs now offer a filter option to narrow down the list of available files
  • "Split Data" command now allows to create test and training data sets and offers file template
  • PCA - speed of display of scores is now improved for large matrices
  • data editor now supports the inversion of markings
  • PLS cross validation protocol now includes the mean error traces of the individual target variables
  • the range of target values when applying a PLS model is now checked for a possible overlap with the descriptors
  • comments of PLSM files are now displayed in the file dialog
  • processing and user interface of correlation function improved
  • ANOVA now displays p-values and allows to create a protocol
  • deletion of files now provides feedback
  • cases of object and variable names are now ignored during sort
  • various minor improvements
  • PCA and PCR now take care of the scaling mode when indicating important components
  • misleading option "adjust matrix size after delete" discarded
  • initial startup process improved

Bug Fixes

  • some minor bug fixes
  • colors in color selection boxes show now readable names (instead of technical colors constant identifiers)
  • DataLab now checks for file versions which are newer than the current program version
  • histogram/cumulative frequ./normal prob. plots of marked data now work as expected if no data are marked
  • cross correlation table does no longer indicate wrong minimum/maximum values when switching from one to another table
  • when loading images for digitisation via Windows explorer the BMP-files are now displayed in the open dialog
  • cross validation in PLS models did not select a random test set (but a consecutive block of data)
  • univariate statistics: all variables can now be selected (was limited to the first 20 variables)
  • levels of measurements have not been copied to and from auxiliary matrices
  • forbidden access to update server via proxy or gateway which requires login is now correctly recognized
  • Durbin-Watson test of regression residuals is now correctly classified if DW statistic is above 2.0
  • marking of data retriggered initialisation of PCA window
  • fluent editing of names and class numbers has almost been blocked by a faulty broadcast event
  • MLR variable selection window did not react on changes of the data matrix layout
  • when storing a PLS model, the names of the variables have been lost under certain circumstances
  • calculating univariate properties resulted in a runtime error when the matrix has less than 6 columns
  • PCR checks now for validity of variables
  • program crashed if size of data matrix was set to a length/width of greater than 2^31
  • program crashed if entire matrix was deleted
  • improved validity check of Windows registry avoids crashes in the base of corrupt registry entries

 

Release < 3.500
Release history of versions before release 3.500 has been deleted for brevity