# Library

Statistics Body of Knowledge - our library content below focuses on the topics in this listing.

Webinars

### Censored Data

Fall 2011 Basic Tools Article

by Hotchkiss, Mindy R.;

This article provides a basic overview of censored data, including how to identify it and what to do with it. Censored data analysis methods and issues are discussed at a high level...

• Filetype: pdf
• Publish date: 2011-10
• Keywords:Censoring, Maximum likelihood estimation

### Probability of Detection Analysis for Eddy Current Inspection Systems

Fall 2011 Mini-Paper

by Brown, Jennifer;

Eddy Current (EC) inspection is a Nondestructive Testing (NDT) method commonly used for flight quality assurance of commercial, military, and rocket engine hardware. One application of EC inspection is to detect surface or near-surface anomalies before they grow to a critical length which could impact the structural integrity of the hardware. EC inspection uses the principal of electromagnetism or the production of a magnetic field by current flowing in a conductor. Anything placed in the magnetic field that has electric and/or magnetic properties will change the field and produce an EC signal. Understanding the relationship between crack size and system response is the basis for determining the detection capability of an EC system. For a given EC system, the relationship between the EC response and crack size can be evaluated by scanning a set of standard specimens with a known number and distribution of crack sizes. The results are analyzed using the "a-hat versus a" analysis method to

• Filetype: pdf
• Publish date: 2011-10
• Keywords:Nondestructive Testing (NDT), Nondestructive Evaluation (NDE), Probability of Detection (POD), Regression, Maximum likelihood estimation, Censoring, Eddy Current Inspection, Residuals

### Statistics Roundtable: Different Roads to Take for Data Analysis

Taken from the Spring 2007 Newsletter

by Anderson-Cook, Christine

This article highlights some of the similarities and differences between the frequentist and Bayesian approaches to analyzing data...

• Filetype: pdf
• Publish date: 2007-06
• Keywords:Frequentist methods, Bayesian, Likelihood function, Maximum likelihood estimation, Least square estimation, Random variables, Sensitivity analysis, Confidence intervals

### In Praise of the Lowly Histogram

Mini Paper Taken from the Fall 1992 Newsletter

by Kaminsky, Frank C.; Davis, Robert D.; Burke, Richard J.;

This paper provides a detailed guide on constructing histograms...

• Filetype: pdf
• Publish date: 1992-09
• Keywords:Histogram, Maximum likelihood estimation, Probability density function, Lognormal distribution, Goodness-of-fit test

### Application of Control Charting to Weibull Data

Mini Paper Taken from the Winter 1992 Newsletter

by Stephens, Paul;

This paper presents an example of one possible use of Weibull statistics for quality control with lot type data...

• Filetype: pdf
• Publish date: 1992-01
• Keywords:Weibull distribution, Statistical process control, Maximum likelihood estimation, Normal distribution, Joint density function, Control charts, Sample Size, Normal plots, Wilk-Shapiro test, Moving range chat, Hotelling's T2 distribution, Correlation