# Graphs

## Histogram

Histogram of the 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

## 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
The

Control Chart is used in Statistical Precess Control

(SPC) to monitor a production precess.

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.