p
Chart—Shows either the fraction or
percent of nonconforming units in a sample.
np
Chart—Shows the number of nonconforming
units in each sample.
c
Chart—Shows the number of nonconformities
per inspection unit.
u
Chart—Shows the number of nonconformities
per inspection unit when the inspection unit
changes.
Pareto—Displays a bar chart of discrete
characteristics with the cumulative percentage
of total superimposed (such as different types
of defect categories.)
Variable Charts
Variable charts provide the investigative tools
essential for continuous quality improvement.
Rather than assessing only failure or nonconformance
rates as with attribute charts, with variable
charts both the data collection and analysis
are refined to measure variability of parts
and processes, even while they remain within
defined acceptance ranges.
X-Bar—Used
to assess the process mean. Each point on the
chart represents the average of a subgroup.
X-Bar
/ Range—Subgroups of 2-30 can be used
with X-Bar charts when limits are calculated
based on range.
X-bar
/ S—There is no limit to subgroup size
when limits are based on sigma. If the subgroup
size varies, the computed limits will vary accordingly.
Individual—Individual
observations are plotted directly on the chart.
Individual
/ Moving Range—The moving range chart
is used to assess variability of processes which
do not conform to natural subgroups.
Moving Range—The moving range chart is
used to assess variability of processes which
do not conform to natural subgroups.
Process Capability—This graph superimposes
a normal curve over a histogram of the data,
and displays numerous values such as C p, P p,
C pk, P pk, CPU, CPL, both actual and estimated
percent beyond specification, etc.
Phase
Charting—Phase charting uses a categorical
variable (such as machine operator, time, lot
number of components) which can be helpful in
identifying sources of variation.
Charts can display the following additional
information:
- Data Tips–point-and-click 'drill down'
capabilities to explore charted results in
more detail;
- Data Table below the graph; and
- Summary Information at bottom of page (single
charts only).
Additional Graphs
The following graphs are provided in addition
to attribute and variable charts:
- Pie
- Bars–clustered or stacked
- Histogram
- Probability Plot
- Scatter Plot
- XY Plot
Graphic Capabilities
Process management and other graphs can be
interactively customized. Operations include:
- Additional text, arrows, lines, boxes and
circles can be interactively placed/edited;
- Graphs can be moved/resized;
- Text fonts, colors and styles can be modified;
- Curve/Bar/Marker colors and styles can be
specified; and
- Legends can be moved and customized.
Graphs can be saved in the following formats:
- Windows bitmap format (.BMP);
- Windows metafile format (.WMF); and
- Placed onto the clipboard in Windows metafile
format.
Statistics
Descriptive Statistics
[View
example]
Minimum
Maximum
Range
Mean
Median
Standard deviation
Standard error of the mean
Variance
|
Coefficient of Variation
Interquartile range
First Quartile
Third quartile
Skewness
Kurtosis
Percentiles
|
Frequency Tables
Statit Express QC can produce 1-way to n-way
frequency and crosstabulation tables and multiple
response tables.
Frequency tables show the distribution of the
values of a variable with the number of occurrences
of each unique value of the variable. Crosstabulation
tables show combined frequencies for two or
more variables.
Grouped Statistics
[View
example]
Statit Express QC can display various statistics
for dependent or analysis variables among various
groupings in a sample or population. The groupings
are determined by using categorical class variables;
e.g., group the dependent variable Diameter
by Operator and Machine.
The following statistics may be computed:
Minimum
Maximum
Range
Mean
Midrange
|
Coefficient of Variation
Standard deviation
Standard error of the mean
Variance
Sum
|
Output Options
Statit Express QC utilizes a Report window
to facilitate the development and printing of
reports which can contain text and graphics.
Statistics output is directed to the Report
window and users can enter/modify text and formatting
interactively. The report window is very similar
to the WordPad editor supplied with MS Windows.
Statit Express QC can read and save to following
file formats:
- Rich Text format files (.RTF)
- MS Word 6.0 (*.doc)
- Text files (.txt)–Graphs will not be
saved.
Data, graphs and reports can all be previewed
and printed.
Data Access
ODBC Data Sources
Users can use Statit Express QC's interactive
Query Builder to read data from any ODBC Data
Source. No knowledge of SQL is required.
Data Files
In addition to its ability to access data though
ODBC, Statit Express QC can read and write data
files in the following formats:
-
Statit
Workspace (*.stw)
- Microsoft
Excel (*.xls)
- Lotus
1-2-3 (*.wk*)
- dBase,
FoxPro, Clipper (*.dbf)
- QuattroPro
(*.wq*, *.wb*)
- SAS
(*.sd2, *.xpt)
- SPSS
(*.sav, *.por)
- Stata
(*.dta)
- Comma
Separated Values (*.csv)
- Tab
Delimited (*.txt)
Keyboard Entry
Data can be interactively entered and modified
using the data grid built into Statit Express
QC.
If you would like additional information, please
call our Sales staff at (800) 478-2892 or send
email to
.
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