Minitab® 16 Workshop Presented by Arved Harding Your friendly, neighborhood statistician Outline A few new features Minitab® ’s Assistant Minitab® Tutorials Quality Trainer Quality Companion 2 Credit where it is due. Many slides were created by Christy Bower, a statistician at Eastman in our Applied Statistics Group. 3 A few new features “Quality People” might like Gage R&R Study (Expanded) – Include additional factors, analyze studies that are balanced or unbalanced, specify if factors are fixed or random, and more. Compare two capability analyses to see if the process has improved. General Regression – Easily specify interaction and polynomial terms, compute confidence intervals for regression coefficients, and more. Export to PowerPoint and Word – Directly export your graphs and Session window output for easy reporting. Nonlinear Regression – Model non-linear relationships between variables. Power and Sample Size – Use seven new tools to calculate power and sample size. 4 More power and sample size options Minitab® provides power, sample size, and difference (effect) calculations for the following procedures: · · · · · · · · · · · · · · one-sample Z one-sample t two-sample t paired t one variance test two variances test one-sample proportion two-sample proportion one-sample Poisson rate two-sample Poisson rate one-way analysis of variance two-level factorial designs Plackett-Burman designs General Full Factorial designs You can also estimate the sample size you need to obtain a specific margin of error using Sample Size for Estimation. 5 Sample size for estimation Parameters include: •Mean •Standard deviation •Variance •Proportion •Rate 6 7 Languages In addition to all the stuff we know about you can have Minitab® in a language other than English if you prefer. Under Tools>Options you can change the language Korean English French German Chinese Spanish Japanese 7 Resources for Minitab® 16 Minitab® Tutorials (45 topics) • Provides detailed descriptions and examples Uses for the given tool or analysis Required data for the analysis How to complete the analysis in Minitab® Minitab® Assistant • Interactive step-by-step guide to completing common data analyses in • Minitab® Provides ready-made reports Report card of analysis assumptions Diagnostic reports for evaluating outliers and stability Summary report of the analysis Quality Trainer • E-learning course with hands-on exercises and quizzes 8 Minitab® tutorials 9 45 Tutorials on many topics of interest 10 2-Sample t Minitab® tutorial 11 What kind of data is required and what the worksheet should look like. 12 As well as an example and step-by-step instructions on how to use the tool 13 Minitab® ’s Assistant When you feel you’re beyond help, consider Minitab® Assistant Minitab® has chosen a specific set of platforms to add in Assistant targeted to help Six Sigma belts get their analyses done more efficiently. 15 16 Check this out 17 18 19 20 Output is much nicer Typical output is a 3-4 page report. Each page can be copied as a graphic to Word or PowerPoint with a right click. Such as this 3 page report from a 2-sample t-test. 21 2-Sample t Test for the Mean of A and B Report Card Check Status Description Unusual Data There are no unusual data points. Unusual data can have a strong influence on the results. Normality Because the sample size of A is less than 15, normality can be an issue. If the data are not normally distributed, the p-value may be inaccurate with small samples. Because normality cannot be reliably checked with small samples, you should use caution when interpreting the test results. Sample Size ! The sample is sufficient to detect a difference between the means. 22 2-Sample t Test for the Mean of A and B Diagnostic Report Data in Worksheet Order Investigate outliers (marked in red). A B 120 80 40 1 2 3 4 5 6 7 8 9 10 11 12 60% 90% 3 5 7 9 11 13 15 17 What difference can you detect with your sample sizes of 12 and 17? Power What is the chance of detecting a difference? < 40% 1 100% 11.652 17.074 For alpha = 0.05 and sample sizes = 12, 17: If the true means differed by 11.652, you would have a 60% chance of detecting the difference. If they differed by 17.074, you would have a 90% chance. Difference Power 11.652 13.081 14.754 17.074 60.0 70.0 80.0 90.0 Power is a function of the sample sizes and the standard deviations. To detect a difference smaller than 14.754, consider increasing the sample sizes. 23 2-Sample t Test for the Mean of A and B Summary Report Statistics Do the means differ? 0 0.05 0.1 > 0.5 Yes No P = 0.004 The mean of A is significantly different from the mean of B (p < 0.05). Sample size Mean 95% CI Standard deviation A B 12 78.333 (71.27, 85.40) 11.122 17 62.294 (53.958, 70.630) 16.213 Difference between means* 95% CI 16.039 (5.6046, 26.474) * The difference is defined as A - B. 95% CI for the Difference Does the interval include zero? Comments 0 10 20 30 Distribution of Data Compare the data and means of the samples. A -- Test: You can conclude that the means differ at the 0.05 level of significance. -- CI: Quantifies the uncertainty associated with estimating the difference from sample data. You can be 95% confident that the true difference is between 5.6046 and 26.474. -- Distribution of Data: Compare the location and means of samples. Look for unusual data before interpreting the results of the test. B 40 60 80 100 24 A warning about using Minitab® Assistant Minitab® has tried to make these platforms as simple and easy to use as they could. In doing so, sometimes they took a slightly different statistical approach than the traditional one. So the p-values may not always match up exactly. Minitab® Assistant Minitab® Menu (assuming equal variances) 25 2-Sample t using Minitab® Assistant 26 Demo using Hospital Rating Data 27 Minitab® ’s Quality Trainer 29 Quality Trainer Interactive guide to review specific statistical topics Learn at your own pace Test your knowledge with exercises and quizzes Certificate of completion for certification credits is available from Minitab® upon completion of all material and quizzes (approximately 20 hours of training) 30 Quality Trainer contents 31 Links to more information For a complete description of the new features see: http://www.Minitab® .com/en-US/products/Minitab® /whats-new.aspx See the link below for access to a Minitab® 16 tour, webinars and more. http://www.Minitab® .com/en-US/products/Minitab® /launch.aspx For prerecorded webinars see http://www.Minitab® .com/enUS/theater/default.aspx To learn what statistical techniques Minitab® assistant uses in each platform and why a detailed white paper has been written, go to http://www.Minitab® .com/enUS/support/answers/answer.aspx?id=2613 32 Pricing info 33 34 Organize 35 Execute 36 Customize and The Dashboard 37 Questions? 38