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Functional Specifications

NWA Quality Analyst®

Control Charts

  • NWA Quality Analyst offers all standard SPC charts plus many special purpose charts.

Variable Control Charts

  • X-bar (Mean)
  • Range
  • X-bar and Range
  • Standard Deviation
  • X-bar and Standard Deviation
  • Individual Measurements
  • Individual and Range
  • Moving Average
  • Moving Range
  • Median
  • Median/Individual
  • Cumulative Sum (CUSUM)
  • Exponentially Weighted Moving Average (EWMA)

Attribute Control Charts

  • Percent Defective (p)
  • Number Defective (np)
  • Defects (c)
  • Defects per Unit (u)

Chart Customization

  • Calculate control limits automatically or enter them manually
  • Automatically adjust control limits for changing subgroup size
  • Create subgroups with up to 99 measurements
  • Select from among five ways to handle missing data
  • Derive control limits by any of three methods, including exact probability limits
  • Choose up to three user-defined, independently calculated sets of control limits
  • Select from four methods of calculating sigma
  • Define up to 23 custom pattern rules; Western Electric rules are the default
  • Shift control limits to show up to 99 process shifts per chart
  • Background colors can be defined for up to three chart zones to create "Rainbow Charts"

Other Charts

  • Scatter
  • Run
  • Normal Probability
  • Quantile
  • Box Plot

Process Capability Analysis

  • Distribution types:
    • Normal
    • Skewness and Kurtosis Adjusted (Johnson)
    • Two Parameter Log Normal
    • Three Parameter Log Normal
    • Truncated Normal
    • Folded Normal
    • Weibull
    • Rayleigh
  • Capability indices can be adjusted for non-normal distributions
  • Bilateral and Unilateral specifications supported
  • Select the indices and statistics to report
  • Confidence bounds provided for capability indices
  • Set histogram bars and scale automatically or manually
  • Multiple variable process capability reports
  • Box plots

Pareto Analysis

  • Show up to 500 defect categories
  • Diagram can be ranked by cost or number of defects
  • Cumulative effects can be graphically displayed

Capability Indices

  • CAM cp
  • CAM cpk
  • Cm
  • Cmk
  • Cp
  • Cpk
  • CPL
  • Cpm
  • CPU
  • CR%
  • "In the Box"
  • K
  • Pp
  • Ppk
  • Tz
  • Zlsl
  • Zmin
  • Zusl
  • Includes Automotive Industry Action Group (AIAG) indices

Exception Reporting

  • Design any number of exception reports for each Data Set and provide a wide range of reports on SPC, specification, and pattern-rule violations.

Short Run Analysis

  • Available for all SPC charts and process capability analysis.

Additional Data Analysis

  • Descriptive Statistics
    • Mean
    • Standard Deviation
    • Coefficient of Variation
    • Standard Error
    • Skewness
    • Kurtosis
    • Moments about the Mean
  • Means (t) Tests
    • Single Sample t-test
    • Unpaired Sample t-test
    • Paired Sample t-test
    • Pearson Product Moment Correlation
  • Chi-square Analysis
    • Bartlett's Chi-Square
    • Difference Among Proportions
    • Equal Expected Frequencies
    • Unequal Expected Frequencies
  • Weibull (Reliability Analysis)
    • Full or Censored Data
    • Maximum Likelihood and Rank Regression
    • Methods
    • Includes Exponential Distribution
  • Non-parametrics
    • Kruskal-Wallis
    • Wald-Wolfowitz Runs Test
  • Correlation
    • Analyze up to 50 variables simultaneously.
  • Single Variable Regression/Curve Fitting
  • Multiple Linear Regression
  • Polynomial Regression
  • ANOVA (one-way)
  • Random Number Generator
    • Integer or Real Data Values
    • With or Without Replacement
    • Uniform or Normally Distributed Data

Data Entry and Management

  • Complete data file creation and maintenance capability, including:
    • Variable Definition
    • Variable Type
    • Format Control
    • Target and Specification Values
    • Data-Entry Masks
  • Data Table Structure
    • Data tables can be up to 500 characteristics by 999,999 rows.
  • Database Connectivity
    • Direct connectivity to Access and Excel
    • ODBC connection to all major databases
    • Supports user-defined SQL
    • Interface to Wonderware IndustrialSQL Server


  • Integrated text and graphics display, user-defined layouts, JPG, PNG, BMP, WMF, GIF, PCX and XML.

Assignable Cause/Corrective Action

  • Predefined Cause and Action text and comments up to 65 characters assigned to any SPC point. Text and Pareto reporting.

System Requirements

NWA Quality Analyst runs on Microsoft Windows® XP SP2 or newer, including 64-bit Windows 7 and Windows 8.  Compatible with Citrix and Micro­soft Terminal Services, and other Windows-compliant thin-client environments.