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The Life Data tab is visible when you view a Weibull++ standard folio data sheet for life data analysis.
Calculate
estimates the parameters of the chosen distribution, based on the current
data set and the specified analysis settings.
Plot
creates a new sheet in the folio that provides a choice of applicable
plot types. For standard folios,
this includes plots such as reliability vs. time, failure rate vs. time,
probability plot, etc.
Quick Calculation
Pad opens the Weibull++
Quick Calculation Pad, which allows you to calculate results, such
as the mean life and the probability of failure, based on the analyzed
data sheet.
Distribution
Wizard opens the Distribution
Wizard, which helps you select the distribution that best fits your
data based on the selected parameter estimation method (i.e., RRX, RRY
or MLE).
3D Plot
creates a 3D plot in the project, allowing
you to graph functions with three variables such as the reliability at
a given time and stress level. The 3D plot is saved under the Multiplots
heading in the current project explorer.
Batch Auto
Run opens the Batch Auto Run window,
which allows you to easily extract data from an existing data set based
on their subset ID.
Specify Points
opens the Specify Points window, which
allows you to adjust the way that the line is fitted to the points for
a rank regression analysis. The ranks will be calculated based on all
of the data points but the regression line will be fitted only to the
points you have specified.
Alter Parameters gives
you two options for manually editing the value of the calculated parameters.
Alter Parameters (w/o Recalculation)
alters the value of one (or more) parameters, while keeping the original
values of the rest of the parameters and the variance/covariance matrix
the same. Alter One Parameters (and Recalculate)
alters one of the parameter values, and then have the software estimate
the other parameter values that would result in a good fit for the model.
For both options, the LK value, solution line on plots and all subsequent
analyses will be based on the modified set of parameters.
Fill Median
Ranks is available only if the data type is free-form.
It allows you to experiment with median ranks and see how they affect
the solution of the analysis. Enter the time-to-failure values in the
"X-Axis value" column, then choose this command. The "Y-Axis
value" column will be filled with the corresponding median ranks.
Auto Group
Data opens the Auto Group Data window,
which allows you to group together identical data points. Grouping data
significantly speeds up calculations when you have a very large data set.
Goodness of
Fit Results opens the Goodness
of Fit Results utility, which uses different tests to determine how
well the parameters of the distribution fit the data.
Insert Data
Sheet inserts a new blank data sheet into the currently active
folio and opens the Weibull++ Folio
Data Sheet Setup window, which allows you to select what types of
data to include in the new data sheet.
Insert Additional
Plot inserts an overlay plot in
the currently active folio. The plot allows you to display results from
multiple data sheets within the folio. This provides an easy visual method
to compare analyses. For example, you may wish to show the reliability
plots of two product designs in the same plot.
Insert General
Spreadsheet inserts a new, blank General
Spreadsheet into the currently active folio.
Select Sheet
opens the Select Sheet window, which allows you to select which sheet
in the current folio you want to be active.
Move or Copy
Sheet opens the Move/Copy window, which allows you to move or copy
any of the sheets within the currently active folio. Select the sheet
that you wish to move and then click (move
to end) to move the selected sheet to the end of all the sheets
in the folio. Select Create a Copy
to create a copy of the selected sheet.
Delete Sheet
deletes the current sheet within the folio. There
is no undo for delete.
Alter Data
Type opens the Weibull++
Folio Data Sheet Setup window, which allows you to change the data
entry columns in the current data sheet. Note that when you change the
setup, you may lose information already entered in the data sheet. For
example, switching the data sheet from one that supports interval data
to one that supports only right censored data will remove all the inspection
times.
Override Plot
Color opens the Override Plot Color window, which allows you to
ignore the default colors of the plotted line and points, and apply a
color that you specify. This setting is activated in the source data sheet
of the plot. This means that when you enable the setting for a particular
data sheet, it applies only to the plots that you create for that data
sheet and not the plots for all other data sheets that may be within the
same folio. Note that only the colors of the lines and points are affected.
Other settings such as the line style and thickness, or the point size
and shape are based on the settings that you have specified in the Plot Items page of the
Plot Setup window.
Set Headers as Default
saves the current column headings as the defaults for new data sheets
of the same type. To reset the default headings, click Reset
Application Settings in the Application Setup.
Apply Default Headers applies the
currently saved defaults to the column headings of the active data sheet.
Add/Remove
Columns allows you to add or remove subset
ID columns in the currently active data sheet.
Color
Data Values allows you to apply different font colors to the entries
in the data sheet for easy visualization. The following commands are available:
Default Color applies a black font color to all the entries in the data sheet
Based on Data Type applies different font colors based on the type of censoring. The colors are: red for failure data (no censoring), green for suspension data, magenta for left-censored data and blue for interval data.
Based on Subset ID 1 applies different font colors based on unique subset IDs in the Subset ID 1 column. If a data point has no entry in the Subset ID 1 column, then the font color is black.
Based on Subset ID 2 applies different font colors based on unique subset IDs in the Subset ID 2 column. If a data point has no entry in the Subset ID 2 column, then the font color is black.
Based on Subset ID Combination applies font colors based on unique combinations of subset IDs in the Subset ID 1 and Subset ID 2 columns. If a data point has no subset IDs, the font color is black, but if a data point has at least one subset ID, then it is treated as having a unique combination of subset IDs.
Note that whenever you edit or add new data to the data sheet, you must choose one of the Color Data Values commands again in order to apply the font colors.
Publish Model
publishes the chosen life distribution as a model
for use throughout the project, in any Synthesis application where models
are used. See Publishing Models.
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