minitab ppt.ppt

8/11/2019 Minitab PPT.ppt

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Introduction to MinitabPREPARED BY

GOPAKUMAR M GNPI ENGINEER


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Minitab MinitabTMis a very powerful, full feature, statistics package

seamless with Excel, PowerPoint .

The Software is used for Stastical &Graphical Analysis for

Six SigmaProjects.

Graphical Capabilities Stastical Capabilities Pareto Capability Analysis

Histogram Hypothesis Test Box Plot Contingency Tables

Scatter Plot Design of Experiments (DOE)

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Objectives

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At the end of this this topic, Introduction to Minitab, youwill be able to:

Describethe basics of Minitab.

Derive statistical parameters for a given set of data using Minitab .

Analyze the given data graphically and statistically using Minitab.


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Outline Introduction to Minitab

Minitab File Types Worksheet Format & Structure

Supporting Data types

Minitab Windows

Example1: Basic Statistics

Minitab for Graphical Analysis

Pareto Analysis Example2: Pareto Analysis

Example 3: Process Capability Index(Cpk)

Conclusion4


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Minitab Files Types

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Worksheet contains the data only.

Takes very little disk space. All of

the Minitab files used training are

worksheet files which use the suffix

.MTW

Project contains a complete

record of actions taken (sessionwindow, history window, graphs

and worksheet(s). Takes more

disk space. Uses the file suffix

.MPJ


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WorkSheet Format & Structure

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Session

Window

DataWindow

Columns C1, C2, C3, . . .

Cells

Rows 1, 2, . . .

Multiple worksheets may be open in different Data windows.

However, only one is active at a time.

Menu

Tool Bar


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Minitab Accepts Three Types of Data: Date/Time,

Text & Numeric

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D suffix

indicates thecolumn

contains

date/time

T suffix indicates

the columncontains text

No suffix

indicates thecolumn contains

numeric data

Data types can not be mixed in a column. If the column contains one cell

that has text in it, the entire column is considered to be text.

/


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Minitab Accepts Three Types of Data: Date/Time,

Text & Numeric

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Column Names

(Type, Date, Count & Amount

Entered Data for Data

Rows 1 through 4

Data Entry Arrow

Data Rows


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Minitab Windows

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Menu BarSession Window:

Analytical Output

Data Window:

A Worksheet different from a Spreadsheet

Column names are above first row3 data types of Columns: Text/ Numeric/ Date

Everything in a column is considered to be the same

variableInfo Window:

Synopsis of worksheet

History Window:

Stores Commands

Tool Bar


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Minitab Windows

Data- just as the name implies

Session- output of most tests and analysis

Graphs- each graph is created in a new window.Graphs are linked to the data but updates only occur when the

Window>Update Al l Graphs Nowcommand is performed orby right clicking on the graph and selecting Update Graph

Automat ica l ly.

Information- column by column summary information about thedata

History- record of actions, useful for creating macros

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Minitab Example 1

Basic Statistics

1) Find mean, median, mode, range, variance, Maximum ,Minimum and

standard deviation(sigma) for the sample data given below:

-3,-2,-1,1,2,3,4,5,6,7,8,9

Open a new Worksheet (in the existing or a new Project)

Type in the numbers vertically in a column

Name the column as DATA

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N

xi

mean ()

N

xi

2

2 )(

variance (2)

Std Deviation()

)( 2


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Solving Using Minitab


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Graphical AnalysisWe have seen that Minitab can be used for statistical analysisof data. Now let us study how we can analyze data

graphically using the tools listed below:

Pareto Chart

Histogram

Dot Plot

Box Plot

Scatter Plot

Matrix Plot

Marginal Plot

Time Series Plot

Run Chart

Minitab for Graphical Analysis

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Pareto Analysis

Pareto chart is named after an Italian economist

Vilfredo Pareto whose theory states that 80% ofwealth is owned by 20% of the population. Based on

this theory, the chart is used to visually depict the

significance level of categories plotted.

The theory that 80% of the problems come from20% of the causes is called Paretosprinciple.

The purpose of the Pareto chart is to highlight the

most important among a (typically large) set of

factors. In quality control, it often represents the most

common sources of defects, the highest occurring

type of defect, or the most frequent reasons for

customer complaints, and so on.

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Vilfredo Pareto1848 - 1923
http://en.wikipedia.org/wiki/Quality_controlhttp://en.wikipedia.org/wiki/Quality_controlhttp://en.wikipedia.org/wiki/Quality_controlhttp://en.wikipedia.org/wiki/Quality_control


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To draw a Pareto chart, follow the path

Minitab> Stats > Quality Tools > Pareto Chart

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Pareto Analysis

Count

Percent

ZoneCount

Percent 32.4 25.0 12.7 10.0 7.8 6.1 2.9 2.9

Cum %

132

32.4 57.4 70.1 80.1 88.0 94.1 97.1 100.0

102 52 41 32 25 12 12OtherFourTwoSixEightFiveThreeOne

400

300

200

100

0

100

80

60

40

20

0

Pareto Chart of Zone


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Minitab Example 2

In Example 2 , we are going to draw a pareto chart for

the Main failures occurred in Midline for PINOT LP3

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Pareto Chart Analysis

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Pareto Chart Analysis


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What is Cpk? It is a measure of how well

a process is within a specification.

Cpk = A divided by BA = Distance from process mean to closest spec limit

B = 3 Standard Deviations (also called 3 Sigma)

A bigger Cpk is better because fewer units will be beyond spec.

(A bigger A and a smaller B are better.)

A

B

Specification

Limit

Specification

Limit

Cpk =

A divided by

B

Process Capability Index (Cpk)

We desire a

minimum of 1.33

and ultimately we

want 2 or more.


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Process Capability Index (Cpk)

Process capability is also the ability of the combination ofMan, machine, methods, material, and measurements to produce a product that

will consistently meet the design requirements or customer expectation.

A minimum of three possible outcomes can arise when the natural process variability

is compared with the design specifications or customer expectations:

Case 1: Cpk > 1.33 (A Highly Capable Process)

Case 2: Cpk = 1 to 1.33 (A Barely Capable Process)

Case 3: Cpk < 1 (The Process is not Capable)


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Measuring Cpk Using Minitab

Example 3

Measure the Cpk Of the Carriage Belt Tension of 32 units

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Measuring Cpk Using Minitab


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Conclusion

Minitab is one of the powerful tool used in Quality

Analysis.

Using Minitab we can easily conduct the Statistical and

Graphical analysis of data.

Minitab is mainly used for the implementation of Six

Sigma Projects.

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Minitab Training

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