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Find a lambda value that is inside the red confidence interval lines. Use the Box-Cox transformation to try to normalize your data. Minitab Release 14 now provides a distribution identification tool and provides capability analysis for large number of other distributions (13 I think) in addition to the Weibull.ģ. Use the Weibull Capability Sixpack to check the probability plot, check the control chart, and then assess capablity. Try to find another distribution that fits your data. If using a mean chart, you could increase your sub-group sample size so that the means are “driven” to normality (via the central limit theorem).Ģ. If you data are not normally distributed then you have several choices:ġ. You also need to assess the stability of the process. That is why I tend to prefer the normal probability plot. If the p-value for the AD test is greater than 0.05, then you can also assume normality, BUT keep in mind that for very large sample sizes the AD test can get picky about normality and tend to say even fairly normally distributed data are not normal. If the data points fall roughly on a straight line, you can assume the data are normal. For most situations this is likely easiest and more intuitive done using a probablity plot (Stat > Basic Statistics > Normality test), but you can also use the Anderson-Darling normality test. It is critial that you assess the normality of the data. For example, enter 1 4 6:10 to signify the set 1, 4, 6, 7, 8, 9, 10.Dieter brought up a very important point. Use a colon (:) to denote an inclusive range. Enter individual row numbers and ranges of row numbers. Row numbers: Include or exclude the specified rows.Brushed rows: Include or exclude rows that correspond to brushed points on a graph.Click Condition to enter the conditional expression. Rows that match: Include or exclude rows that match a condition.All rows/ No rows: Include all rows or exclude no rows.From Specify Which Rows To Include/ Specify Which Rows To Exclude, select one of the following:.Under Include or Exclude, specify whether to include or exclude rows from the copied columns.To specify the rows to include or exclude, click Subset the Data and complete the following steps.To include a name for the constants, select Name the constants containing the copied data.For example, if the column contains 20 values, you must enter 20 constants. The number of constants that you enter must equal the number of values in the column. In In current worksheet, in constants:, enter the target constants (for example, K1 K2 K3).In Copy from column, enter the column to copy.
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MINITAB EXPRESS FORMULA TAB HOW TO
The following table describes how to move to locations in the active worksheet. You can also use the Editor menu or your keyboard to move the cursor and make other cells active. When you click in a cell, the cell becomes active.