# Chapter 2 Minitab for Data Analysis KANCHALA SUDTACHAT.

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Chapter 2 Minitab for Data Analysis KANCHALA SUDTACHAT

Basic Command Example 2-1: tensile 7226, 7301, 7219, 7350, 7170, 7377, 7150, 7398 Basic command 1.Open the worksheet sample.MTW 2.Sort the data 1.Data-> Sort 2.Double click on C1 tensile on the left side. 3.Click in the By Column box, then double click again on C1 tensile on the left pane. Don’t check Descending, if you want increasing. 4.Click on the circle Column(s) of current worksheet, fill in C2

Basic Command Basic command 3.Random data 1.Calc-> Random data->Normal 2.Number of rows of data to generate 100. Store in column(s): C3 3.Mean: 7274, Standard deviation: 95.6

Simple Analysis Sample mean and sample variance 1. Stat -> Basic Statistics -> Display Descriptive Statistics In the Display Descriptive Statistics dialog box ◦Double click C3 S tensile to Variables ◦Click Statistics dialog box

Simple Analysis Graphs-> Check Individual value plot

Display

Using Help

Dot plot 1.Open worksheet Newcomb.MTJ 2.Graph -> Dotplot -> Simple -> OK 3.Double click C1 Newcomb

Stem-And-Leaf 1.Open worksheet Table2-2.MTJ 2.Graph -> Stem-and-Leaf 3.Double click C1 Strength

Histogram 1.Open worksheet Table2-4.MPJ 2.Graph -> Histogram -> Simple 3.In Graph variables, Double click C1 Distance

Histogram Graph -> Histogram -> With fit

Histogram Fix number of intervals After obtained result of histogram 1.Double click X Scale -> Display Edit Scale 2.Choose Binning -> Number of intervals -> 10

Pareto 1.Stat -> Quality Tools -> Pareto Chart 2.Double click C1 Type -> Defects or attribute data in: 3.Double click C2 HullLosses -> Frequencies in: 4.Check: Do not combine

Pareto

Box Plot Single variables 1.Graph -> Boxplots- > Simple 2.Dialog box: Boxplot – One Y, Simple 1.Double click C1 Strength to Box: Graph variables 2.Click: Data View command -> Check: Inter quartile range box, Outlier symbols -> OK -> OK

Box Plot Comparison 1.Graph -> Boxplots- > With Groups 2.Dialog box: Boxplot – One Y, With Groups 1.Double click C1 Strength to Box: Graph variables 2.Double click C2 Status to Box: Categorical variables for grouping 3.Click: Data View command -> Check: Inter quartile range box, Outlier symbols -> OK -> OK

Time Series Plots 1.Graph -> Time Series Plot -> Simple 2.Double click C1 Strength to Box: Series: -> OK

Individual Value Plot 1.Graph -> Individual Value Plot 2.Multiple Y’s -> Simple

Individual Value Plot 1. Select -> Graph variables C1 Day1 C2 Day2. C8 Day8 2. Click -> Data View…

Individual Value Plot 1. Individual Value Plot-Data View Check: - Individual symbols - Mean symbol - Mean connect line 2. Click -> OK -> OK

Individual Value Plot

Interval Plot 1.Graph -> Interval Plot 2.Multiple Y’s -> Simple

Interval Plot 1.Select Day1 – Day 8 -> Graph variables: 2.Click: Data View

Interval Plot Check box - Interval bar - Mean symbol - Mean connect line Click OK -> OK

Interval Plot

Scatter Plot 1.Graph -> Scatterplot… -> with Simple 2.Dialog box: Scatterplot - Simple 1.Double click C2 Pull Strength to Y variable 2.Double click C3 Wire Length to X variable 3.Click: OK

Scatter Plot

Scatter Plot: Correlation & P- Value 1.Stat -> Basic Statistics -> Correlation… 2.Double Click: C2 Pull Strength (Response) 3.Double Click: C3 Wire Length (Control) 4.Check: Display p-values 5.Click OK

Scatter Plot: Correlation & P-Value Correlations: Pull Strength, Wire Length Pearson correlation of Pull Strength and Wire Length = 0.982 P-Value = 0.000 Correlations: Pull Strength, Die Height Pearson correlation of Pull Strength and Die Height = 0.493 P-Value = 0.012

Marginal Plots with Dot Plot 1.Graph -> Marginal Plots -> with Dotplots 2.Dialog box: Marginal Plot with Dotplots 1.Double click C1 Strength to Y variable 2.Double click C3 time to X variable 3.Click: Marginal Options 4.Check: Dotplot and Y only 5.OK -> OK

Marginal Plots with Dot Plot

Matrix Plot 1.Graph -> Matrix Plots -> Matrix of plots: Simple OK -> OK

Matrix Plots 2.Dialog box: Matrix Plot – Matrix of Plots, Simple Start with control variables 1.Double click C3 Wire Length -> Graph variables 2.Double click C4 Die Height -> Graph variables End with response variable 1.Double click C2 Pull Strength -> Graph variables 3.OK -> OK

Matrix Plots

Questions?