# Graphs

## Histogram

Histogram of the data set. Normal distributed data set Not normal distributed data set

http://en.wikipedia.org/wiki/Histogram

## Box plot

• Top whisker: Top box (Q1) + 1.5 x interquartile range (Q1-Q3)
• Top box (Q1) below this value are 75% all the data points.
• Median (Q2)
• Interquartile range 50% of all the data point are within this range.
• Bottom box (Q3) above this value are 75% of all the data points
• Bottom whisker: Bottom box (Q3) - 1.5 x interquartile range (Q1-Q3)
• o outliers between 1.5 and 3 times the interquartile range
• + extreme outliers above 3x the interquartile range http://en.wikipedia.org/wiki/Boxplot

## Time graph

Shows how the data-set behavior over time.

### Legend

• Green line Nominal value
• red lines min and max tolerance borders
• light gray outliers between 1.5 and 3x the interquartile range
• Dark gray extreme outliers above 3x the interquartile range ## Correlation graph

Shows graphical how the data set correlates with the comparing data set.

### Legend

• light gray outliers between 1.5 and 3x the interquartile range
• Dark gray extreme outliers above 3x the interquartile range Correlation No correlation

## Individual dot plot

### Legend

Shows all individual data points. Useful when to see the influence on rounding of the data see graphs.
• light gray outliers between 1.5 and 3x the interquartile range
• Dark gray extreme outliers above 3x the interquartile range  Data file

## Calculations

### 95% confidence interval for Mean ### 95% confidence interval for STDEV To get the Confidence interval click on the graph of the data-set and it will be visible in in the graph pop-up. ## Distribution fitting

Use the Distribution fitting function Tools=>Distribution fitting. The graph best Correlation is the best fitting distribution. Data file

## Control Chart

The Control Chart is used in Statistical Precess Control (SPC) to monitor a production precess. ## Multiple Correlation Graph

The multiple correlation Graph is to get a fast overview of all possible correlations. ## DOE response graphs

Shows the influence of the levels of each factor in the DOE.

### Legend

• The black line in the graph is the mean value of the factor.
• The two gray lines are the mean plus and minus 1 STDEV to give a indication of the influence of the factor on the spread. 