• SPC and Injection Moulding
• Is SPC (statistical process control) useful?
• SPC (Statistical Process Control) Overview
• Validation of Cpk and Ppk calculations - Sheet to check Cpk and Ppk values
• CP CPk from Min Max Data?
• Name for the Control Chart Constants (A2, A3, d2, D3 etc)
• XR-charts question concerning R
• Calculation of Cpk and Ppk for an unstable process
• Folded Normal Distribution - Geometric features from our machine shop
• Random 'Normal Distribution' Numbers in Excel
• SPC Reaction Plans for Cpk of <1.33 during mass production
• How to measure Machine Capability index Cpm
• SPC Training - I want to develop my knowledge in statistical tools
• ImR and P chart comparison on % defective data
• Confused over the notion of "offline (engineering) analysis"
• Outliers in XmR chart
• When to change UCL and LCL - SPC Software
• A collection of Dr. Wheeler's Articles from SPC Toolkit column of Quality Digest
• Control Charts - Points TOUCHING Limits = Stable?
• Dr. Wheeler's not using p-chart for countable events?
• Time frequency estimation for SPC data collection
• SPC application for paint manufacturing industry
• P-Chart with variable sample size - How to update the chart?
• How to effectively apply short run SPC
• I MR chart - Methodology needed
• How to identify whether my data is non-normal?
• Calculating 1 sigma and 2 Sigma limits in Control Charts
• Designing control chart for non-normal variables
• Bob's Statistical process control for precision machining
• SPC roll-out Plan for company-wide SPC
• How to choose constants when sample size larger than 25?
• Individuals and Moving Range Chart problem
• Actual probability of TYPE I error for 3 sigma P-chart
• What type of Control Chart? USL of 3 and a lower spec limit of 1
• Precontrol Charts for unilateral tolerances on 'new' processes
• Sampling Spreadsheet to help determine the sample size for sampling plans
• Hypothesis Test - Determining if a second wash is worth performing
• Gauge R&R on Software measurement that varies with environmental conditions
• Conflicting ppm rates - Customer requires 0 ppm - Suppliers work to 50 ppm
• Help on p-chart - Computing new control limits and chart suitability
• Analyzing Data with a Non-Normal distribution
• The basics of DOE (Design of Experiments) & Validation
• Normality of distribution prior to Cpk and PpK
• Tolerance Limit Constants - Calculating tolerance limits using JMP
• GR&R (Gage R&R) study for large distances
• Setting Process Control Limits - Is this process out of control?
• Control Chart - Stable BUT with Special Cause?
• Monitoring a shift of the average in an SPC chart
• Capability with non normal data
• Control Chart on Paper vs. Software where trend cannot be seen (Alarm only)
• Use of sampling plans like MIL-STD-105 E or ANSI Z1.4?
• Hypergeometric Distribution - Is my calculation correct and my conclusion?
• Calculating Control Limits for nonconformities - 1000 accounting transactions per day
• Cpk vs Ppk - Which should you use and How to Calculate Cpk and Ppk
• SPC for Dimensions after Vibration Welding - Company making plastic elements
• Does the data in a control chart have to be normally distributed?
• SPC presentation - How to convince someone to use SPC - Grind diameters
• Conceptual Questions on SPC - Operating characteristic curve of a control chart
• What is Average Run Length & Average Production Length when used in Control Charts?
• R Chart use - What does "general quality level" mean?
• How many pieces are recommended to release PCA study?
• T-stat vs. Z-stat Calculation - Sampling
• Standard Error vs. Confidence Interval (not confidence level)
• SPC on the shop floor - We are a job shop
• Control Chart out of control? Cpk - Process Out of Control
• DPPM - 'Standard' minimum quantity to measure DPPM?
• Is SPC appropriate in batch system/Job Shop?
• The use of statistics at a medical device manufacturer
• Pre History of SPC plus minus tolerances
• SPC (Statistical Process Control) for Medical Device Company
• How Can I Create a Bell curve in Excel 2007
• Can I use Nonparametric Method to big samples?
• Simple Probability Statistics - Assembly Failure - Binomial Equations
• Is it possible to calculate percentiles for rating scale variables?
• Use of Non-Parametric Statistics and Non-Normal Data
• SPC Daily Monitoring and Subgroup Size
• Calculation of Uniform Distribution
• Statistical Analysis SPC Trend explanation needed
• Measuring level of awareness in business processes and procedures
• Sorting instruction when point out of control chart
• How to distinguish two types of causes (common cause & special cause)
• Correlation or Mann Whitney test results? Which to use
• Uncertainty greater than measurement - Air infiltration testing
• What type of SQC or SPC Techniques can be implemented in Machine Shops
• What is Cgk? (Index of Testing Means Capability)
• Hypothesis test help/sample sizes/advice - Two different polycarbonates
• Tight Control Limits - Tape & Reel Process, the process of packaging ICs
• Self define the UCL and LCL instead of by Calculation
• Methods for estimating standard deviation
• SPC training company in UK
• Geometric Tolerancing and SPC - Calculating position upper and lower control limits
• Designing Control Charts - Variable with Small Variation and Tight Control Limit
• Key Performance Indicators (KPIs) book - Reviews and suggestions wanted
• Reactions to out of control X bar and R charts?
• Centerless Grinding (SPC) - My process is extremely out of control
• Short Run Charts - Sample size N=1
• Index Years in Regression Models
• SPC, The Big Picture
• Maintenance Schedule - Flow Soldering
• SPC Excel macro add-in - File Attached
• How to Calculate Out-of-Trend Results
• Is Parts/Process Average Testing SPC by Another Name?
• GD&T and "Fixed Fastener formula" (ASME Y14.5)
• Employee satisfaction Index
• Calculating Cpk for Tubing Wall Thickness - Extrusion Process - How to approach?
• Choosing number of subgroups and subgroup size
• Probability of points outside of...
• Variable sample size - Xbar-s charts - How to select A3 and B4
• Confidence in attribute testing
• Help with t test Mintab output
• Design of Experiment (DOE) for Heat Treatment Process
• Creating a Graph with 2 different Value axis in Excel .xls
• What type of Control Chart should I use for this Data
• Correlation using t-test and correlation coefficient - What is the correct result?
• KPIs required by TOP Management for strategic planning
• Difference between Z score & COV?
• Control chart for operators - Data for Setting Mean, UCL and LCL
• Area under Standard Normal Curve (please help)
• Queuing System - Calculating Average Arrival Rate λ
• Starting SPC program - Am I understanding and doing it right?
• Quality estimation of one and an entire set of elements
• NWA (Northwest Analytical, Inc.) SPC software - Your Opinion, Review and Experiences
• Calculation for extending control limits
• Insufficient data - Three months only
• U Charts, Defects and 100% Inspection
• Estimate Spread of Tolerance Stackup for each Dimension to Cp
• Question on Cp index - Calculating and Interpreting Cp and Cpl.
• Data Types and Charts - Process has different work types and sub-work types
• Statistical Process Control - Service Delivery (Time)
• Starting a Small Lot SPC (Statistical Process Control) program
• Learning Statistical Process Control - I need a crash course in SPC
• Calculating Response Rate for Employee Satisfaction Survey
• Machine Capability Studies on CNC Lathes
• What Histogram Chart is Good for Varying Measurements?
• Project to Reduce Destructive Sampling in Crimping Process
• Help Interpreting "Variable Tolerance Limit" - MMC Modifiers - Geometric Tolerance
• Application of Statistics/ SPC tools in Oil Refineries
• Calculating Standard Error for a percentage (binary question) from a sample survey
• Western Electric Company (WECO) Rules - How many are there?
• Is it Time for New Rules for SPC (Statistical Process Control)?
• SPC Chart Run Rules - 7 in a row vs. 8 in a row
• How to Set Rules to Review SPC Center Line, UCL and LCL?
• SPC (Statistical Process Control) and SQC (Statistical Quality Control) - Difference?
• SPC (Statistical Process Control) for Unilateral Tolerance
• Statistical Analysis Problem - Pooling Information for 8 Hour Shifts
• Moving Range or Range Charts for Subgrouped Data
• Understanding Control Charts Methodology for Attributes like Plug Guages.
• Is DPM defective parts per million a form of Attribute Data Sampling?
• Statistical Technique for Rating Samples - Amount of Wear on Part
• SPC Chart pro forma - Seeking word .doc or excel .xls spreadsheet
• Free calculator for SPC & MSA
• Continuous Gauge Control Charting
• Can I still use control chart to control my process even if my process is not capable
• Histogram Attributes and Requirements
• Fuzzy Logic - Real or Not? Hot or Not?
• Statistical Classification or Taxonomy to make a Thesaurus for a University Project
• How to Calculate Standard Deviation using Casio fx-95 MS Calculator?
• Any 'Rule of Thumb' for Acceptable Cpk Value - Injection Molding?
• Are Process Behavior Charts the only way to Analyze Deviations from Targets?
• How to Create Sample Subgroups?
• Simplified Statistical Sampling Plan - Printing Industry
• CMM SPC - Does part measurement order matter?
• Introducing individual chart to accountants
• Basic SPC Training to Train Assembly Line Operators on SPC Charting
• Steps to Draw a CUSUM Chart with an Example
• Using Discrete Data As Continuous Data - Forming laminates around different radii
• Individual/Moving Range Chart (IMR Chart) in Excel
• EWMA Chart - Data needed to Calculate EWMA, UCL, and LCL Values
• Understanding variation/managing chaos - What is Variation in the numbers?
• Why we take the Median as a Centerline for a Run Chart
• Selection Procedure for the Use of Control Charts (Apendix C)
• Capability Studies and Monitoring Runs at a Metal Stamping Facility
• Rational Subgroup and Estimation of Variability Due to Common Causes
• Is Calibration Required for Equipment/Devices Used for Measuring Support Services
• Control Charts for OEE (Overall Equipment Effectiveness)
• Can Ppk value be greater than Cpk and if yes, under what conditions?
• Monthly Indicator to Monitor Employees Clocked-in Time
• Comparing Variation - A CMM and an On-Line Inspection Station
• Area Under Normal Curve between the Scores for z=2.20 and z=0.85
• When to use Intraclass Correlation Coefficient vs. Coefficient of Variance
• Customer Satisfaction Measurement
• Formula for I Control Chart Limits - Different values for E2 constant of IMR?
• Applying SPC in a Computer Assembly Shop
• SPC, Customer Specific Requirements and Characteristics on Profiles?
• Hampel Test for Outliers and how it differs from a Grubbs Test for Outliers
• 100% Sort Verification - Statistical Method for Evaluating Suspect Material
• Root Sum Square and Statistical Tolerancing help needed
• Comparing Histograms - Bimodal Distribution?
• Can you Set Inspection Frequencies Scientifically?
• Is there any way to calculate the area under curve for large 'Z' values?
• Is it possible to get Pp,Ppk more than the within subgroup (Cp,Cpk's) indices?
• Are Difference-bar & R appropriate for drift check for working standards?
• Sources of Variation in Making Custard Cakes
• Percent of Tolerance - Cpk - Low lot sizes (40-60 pcs.)
• Reaction to Out of Control SPC Charts
• Statistical Analysis of all Key Processes
• Manufacturing Allowance through Statistical Method
• Operations Management SPC Homework - Assistance Required, Please!
• SPC (Statistical Process Control) - I have data, now what?
• PPM (Parts Per Million) Measurements - Parts vs. Opportunities

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