2. NUEVAS FORMAS DE CONVIVENCIA EN LAS FAMILIAS
3.8 FASES DE IMPLEMENTACION DEL PROYECTO
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Process Analysis control chart troubleshooting
This section explains troubleshooting methods for some Process Analysis control chart problems that can occur.
The bottom graph of my control chart is a zero flat line
Your X-bar & range or X-bar & standard deviation control chart has a range or standard deviation graph with a zero flat line.
Cause: The Process Analysis engine retrieves one row per sample unit from the query. The standard deviation and range statistics are computed based on a single, aggregated figure, and therefore return zero for each sample unit.
Action: Remove the aggregate function from the measure object.
The sampling list in my control chart is empty
The sampling list is empty in the "Data Collection" step of the Process Analysis "New Control Chart" wizard.
Cause: When you create an "Individuals & Moving Range" or "Moving
Average & Moving Range" control chart where the sampling list is empty,
the appropriate sampling is not available. The "New Control Chart" wizard filters the sampling list to systematic samplings the size of 1.
Action: Create a systematic sampling of size 1. The limits and center line do not appear on my control chart
Even though you specified the auto-calculation limits, the run line is displayed alone.
Cause: The baseline is wider than the chart history. Action: Do one or more of the following:
• Reduce the baseline limits calculation to match the chart span and refresh the chart.
• Bring in more history.
• Wait the amount of time necessary for the chart span to meet the baseline calculation.
The run line shows the same value continuously in my control chart The control chart run line shows the same value.
Cause: The Process Analysis engine issues one query for each hourly sample for a control chart that has the time-based hourly setting based on a universe that uses the following date prompts:
• @Prompt('BEGIN_DATE','D',,mono,free) • @Prompt('END_DATE','D',,mono,free)
The time predicate includes the day element but is missing the time. All hourly queries for a given day are the same, and therefore return the same results.
Action: Replace the date prompts with date-time prompts in thefact_ta ble.fact_timestamp:
• @Prompt('BEGIN_DT','D',,mono,free) • @Prompt('END_DT','D',,mono,free)
The control chart does not show a new member in the existing group The control chart does not show a new member of a group.
For example, you created a control chart called Cost by Department and a new department has just been added to the source database. However, this new department is not in the control chart, even though you have refreshed the chart.
Create a new control chart for the group.
Process Analysis alerts do not work on my new repository
You have a new repository on which you have defined control charts and alarm rules, but the alert does not work, even though red circles show on the graph.
Create the following alerts in Performance Manager in the "Rules" sub-tab: • SPCAlert
This rule needs to have a Public scope and have the following rule description:
On this named event: SPCAlert if a condition is met, create the alert: SPC Alert.
• SPCMail
This rule needs to have a Public scope and have the following rule description:
On this named event: SPCMail if a condition is met, send an email.
For more information in creating rules, see the Performance Manager documentation.
Decimals do not show on the control chart
The numbers displayed in the legend of the control chart appear truncated without decimals.
In the source universe of the control chart, assign a number format to the measure with the right-click menu. In Dashboard and Analytics Setup, update the universe and check the properties of the measure object to verify that the number format is updated.
Large numbers overlay the control chart border
The control chart analytic is plotting large numbers that go over the graph border.
Apply a/1000transform to the SQL of the measure object on which the control chart is based, and assign a custom format using the right-click menu. Make sure you update the universe in Dashboard and Analytics Setup. Click the measure object to see the number format in the universe set up screen. You must purge and refresh the control chart to see the new format in the analytic.
The EWMA run is identical to the Shewhart run in my control chart
You specified a weighting factor of '1'. The EWMA computation assigns a 100% weight to the X-bar current sample, while 0% is assigned to the previous samples.
It is common practice to use a weighting factor between 0.05 and 0.25. Specify a weighting factor of 0.2 to assign a 20% weight to the current sample. Building a dashboard with too many control charts
If you have created many control charts and you want to include them in a corporate dashboard, you do not have to go through the Dasboard Builder
"Create New Analytic" workflow for each control chart.
Use the Control Chart applet as an analytic. In the edit mode of a dashboard, select Toolbox > Analytics Services > Control Charts.
Whenever a control chart is created, it automatically appears in the corporate dashboard. The end user selects a control chart from the list on the left and the control chart appears on the right.
The control chart takes a long time to refresh the first time
Cause: You created a control chart using a time-based sampling (such as Every Hour); the initial refresh of the chart can take a long time.
For example, if the raw source data starts September 1st 2004 and the sampling start date has been specified as 'January 1st 2004', the Rules engine runs one query for each hour starting Jan 1st. Useless queries (24x30x8) are run.
Action: Use a more precise sampling. In the example, you use the start date 'Sept 1st 2004'.
Note: This issue does not occur with systematic samplings that use one single query for all periods from start date to current date.
Related Topics
• What is a sampling?on page 267
Displaying time periods on the X axis of the control chart
You created a Process Analysis control chart using a time-based sampling but you cannot display the time on the X axis.
Problem: The control chart shows the sample number on the x-axis with the time period exposed only in the tool-tip.
Resolution: Use a custom Desktop Intelligence report using the 'Control charts' universe (CI_SPC.unv) to display the period on the x-axis. Specification limits do not show on the control chart
You have defined Specification limits for a control chart but only the control limits appear in the analytic.
The control chart analytic allows you to plot the control limits, not the specification limits. Specification limits apply to individual measurements, but not to the summary statistics used in control charts (such as X-bar, Range, Standard Deviation and Moving Average).
For this reason specification limits can only be used with an Individuals & moving range control chart, because it includes the upper and lower Specification Limit measure objects that allow you to build a Desktop Intelligence query and plot the specification limits in a trend line chart.
Process Control Analytics (Samples)
The following samples based on the Control Chart analytic.
These samples are available at Dashboard Builder > Analytic Catalog >
Process Control Analytics Samples:
Shewhart charts for Attribute data • c chart • u chart • u chart standardized • np chart • p chart • p chart standardized
Shewhart charts for Variable data • X-bar & range
• X-bar & standard deviation • Median and range
• Individuals & moving range
• Moving average and moving range CUSUM and EWMA charts
• Cusum on defects • Cusum on individuals • Cusum on x-bar • EWMA on rejects • EWMA on individuals • EWMA on x-bar Related Topics
• Control Chart analytic based on a Process Analysis Control Charton page 177
c chart
The c chart on the Process Control Analytics tab in the Dashboard Builder Analytic Catalog is an example of a Defects (c) control chart. It monitors the number of defects, errors and accidents with a constant sample size.
Related Topics
• What is a defects (c) chart?on page 211
Cusum on defects
The Cusum on defects chart in the Process Control Analytics tab of the Dashboard Builder Analytic Catalog is an example of a Defects (c) chart containing a cumulative sum. This chart is a prevention tool as it gives signals when defects are likely to happen.
Related Topics
• What is a CUSUM control chart?on page 210 • What is a defects (c) chart?on page 211 Cusum on individuals
The Cusum on individuals chart in the Process Control Analytics tab of the Dashboard Builder Analytic Catalog is an example of a Defects (c) chart containing a cumulative sum where the Individual data option is activated. This chart signals small changes on the individual chart.
Related Topics
• What is a CUSUM control chart?on page 210 • What is a defects (c) chart?on page 211
Cusum on x-bar
The Cusum on x-bar chart analytic in the Process Control Analytics tab of the Dashboard Builder Analytic Catalog is an example of a Defects (c) chart containing a CUSUM. It signals small changes on x-bar chart data.
Related Topics
• What is a CUSUM control chart?on page 210 • What is a defects (c) chart?on page 211
EWMA on individuals
The EWMA on individuals chart in the Process Control Analytics tab of the Dashboard Builder Analytic Catalog is an example of a Defects (c) chart containing an EWMA where the Individual data option is activated. You can use this chart when the data is not independent or is auto-correlated.
Related Topics
• What is EWMA?on page 211
• What is a defects (c) chart?on page 211
EWMA on rejects
The EWMA on Rejects chart in the Process Control Analytics tab of the Dashboard Builder Analytic Catalog is an example of a Percent rejected (p) chart with the EWMA configured, and made into Standardized control charts. It signals small shifts in a p chart or standardized p chart.
Related Topics
• What is EWMA?on page 211
• What is the percent rejected (p) chart?on page 218 • What is a standardized control chart?on page 220
EWMA on x-bar
The EWMA on x-bar chart in the Process Control Analytics page of the Dashboard Builder Analytic Catalog is an example of a Defects (c) chart containing an EWMA. It shows small changes on x-bar data.
Related Topics
• What is EWMA?on page 211
• What is a defects (c) chart?on page 211 Individuals & moving range
The Individuals & Moving Range chart on the Process Control Analytics sample analytics tab in the Dashboard Builder Analytic Catalog shows how you can monitor individual values.
Median and range
The Median and Range chart in the Process Control Analytics tab of the Dashboard Builder Analytic Catalog is a sample of an analytic that monitors variables with a constant and relatively small sample size.
Related Topics
• What is a median?on page 319 • What is a range?on page 218
Moving average and moving range
The Moving Average and Moving Range chart on the Process Control Analytics tab in the Dashboard Builder Analytic Catalog monitors individual values where each sample has one value.
Related Topics
• What is a moving average & moving range chart?on page 217 • What is the moving average?on page 325
• What is a range?on page 218
np chart
The np chart on the Process Control Analytics tab of the Dashboard Builder Analytic Catalog is an example of a Number rejected (np) chart.
Related Topics
• What is the number rejected (np) chart?on page 217 p chart
The p chart on the Process Control Analytics tab of the Dashboard Builder Analytic Catalog is an example of a Percent rejected (p) chart.
Related Topics
• What is the percent rejected (p) chart?on page 218
p chart standardized
The p chart standardized on the Process Control Analytics tab of the Dashboard Builder Analytic Catalog is an example of a Percent rejected (p) chart made into a standardized control chart. This chart is useful for short-run production.
Related Topics
• What is a standardized control chart?on page 220 • What is the percent rejected (p) chart?on page 218
u chart
The u chart on the Process Control Analytics tab in the Dashboard Builder Analytic Catalog is an example of a Defects per unit (u) chart.
Related Topics
• What is a defects per unit (u) chart?on page 211
u chart standardized
The u chart standardized on the Process Control Analytics tab in the Dashboard Builder Analytic Catalog is an example of a Defects per unit (u) chart made into a standardized control chart. This chart flattens the u chart limits. It is useful for short run production.
Related Topics
• What is a standardized control chart?on page 220 • What is a defects per unit (u) chart?on page 211 X-bar & range
The X-bar & Range chart on the Process Control Analytics tab in the Dashboard Builder Analytic Catalog monitors a variable with a constant and relatively small sample size.
Related Topics
• What is an X-bar & range chart?on page 225