Toolbox   - Data        - failure        - suspension        - interval   - Distributions        - Weibull (2 and 3 parameter)        - Normal        - LogNormal (2 and 3 parameter)   - Parameter Estimation        - Regression on X        - Regression on Y        - Maximum Likelihood   - Confidence Intervals for parameter        - Fisher Information Matrix        - Likelihood Ratio (only in combination with           Maximum Likelihood parameter Estimation)   - Graphs        - Q-Q-Plot        - Threshold             - adjusted for Threshold (Weibull or LogNormal)             - not adjusted for Threshold (Weibull or LogNormal)        - confidence bounds             - on X             - on Reliability        - Contour Plot (Scale vs. Shape Parameter)        - Failure Rate        - Density   - Options        - Pre define parameter value(s)        - Add table of descriptive statistics on chart sheet        - Combine results of several data sets in one graphData  arrangement   Single data set/variable         Always arrange data as follows:               Column 1: End Time (empty cells not allowed here)               Column 2: Status (1 = failure or interval; 0 = suspension)               Column 3: Count (# of data points that match Column1 and Column2)               Column 4: Time of Last Inspection (for interval data only)         The number of selected columns defines how ExStat interprets the data set:               1 column selected:  data set contains failures only; no grouping (i.e. Count =1)               2 columns selected: data set contains failures and suspensions; no grouping               3 columns selected: data set contains failures and suspensions; with grouping               4 columns selected: data set contains interval data   Multiple data set/variables         Multiple data sets are stored below each other in data sheet                Column 1:     Group variable that identifies the data set/variable                Column 2,...: Same as for single data setDetails   ExStat always groups data      ExStat groups the information by each distinct failure/suspension value. Calculations are based on distinct values. The number of plotted data points (Q-Q-plot) equals       the number of distinct failure values.   Interval Data      Interval midpoints will be used as failure values if the regression (on X or on Y) is used to estimate the parameters. Mathematics   most of the mathematics is nicely described in Reliasoft's Weibull++ manual Examples        failures only          Q-Q plot ; 3 parameter Weibull                                data  charts  result1   result2   result3         Q-Q plot adjusted; 3 parameter Weibull                            charts           3 parameter Weibull                                                failure rate      density    contour plot    grouping , failures only ,   Q-Q plot                               data  charts    grouping , suspensions, contour plot                            data  charts      grouping , suspensions, interval data , q-q plot             data  charts  result1  result2    multiple variables in one chart                                     data  q-q  contour  summary  individuals