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.
2.
3.
4.
Data-> Sort
Double click on C1 tensile on the left
side.
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.
Click on the circle Column(s) of
current worksheet, fill in C2
Basic Command
Basic command
3.
Random data
1.
2.
3.
Calc-> Random data->Normal
Number of rows of data to
generate 100. Store in
column(s): C3
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.
2.
Double click C1 Strength to Box: Graph
variables
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.
2.
3.
Double click C1 Strength to Box: Graph variables
Double click C2 Status to Box: Categorical
variables for grouping
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.
2.
3.
Double click C2 Pull Strength to
Y variable
Double click C3 Wire Length to
X variable
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.
2.
Double click C1 Strength to Y variable
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?