Stephen Luko - Academia.edu (original) (raw)

Papers by Stephen Luko

Research paper thumbnail of Reviews of Standards and Related Material: Comparing Acceptance Sampling Standards, Part 1

Quality Engineering, 2013

In this first part of a two-part series, common attribute sampling standards are discussed and co... more In this first part of a two-part series, common attribute sampling standards are discussed and compared.

Research paper thumbnail of Metrics and Conversions for Process Quality

SAE technical paper series, Mar 19, 2002

Research paper thumbnail of Comparing Acceptance Sampling Standards, Part 1

Quality Engineering, Dec 1, 2012

Research paper thumbnail of “Zero Defects”, Statistically Considered

SAE technical paper series, Sep 11, 2000

Research paper thumbnail of Attribute Reliability and the Success Run: A Review

SAE technical paper series, Sep 8, 1997

Research paper thumbnail of Statistical Standards and ASTM, Part 2

Quality Engineering, Dec 3, 2010

Research paper thumbnail of Risk Management Terminology

Quality Engineering, Jul 1, 2013

ABSTRACT Three new standards related to the risk concept appeared in January 2011. These standard... more ABSTRACT Three new standards related to the risk concept appeared in January 2011. These standards are an adoption by the American National Standards Institute (ANSI) of an ISO suite of documents developed in conjunction with the American Society of Safety Engineers (ASSE) concerning risk vocabulary, risk management, and risk assessment techniques. This article describes International Organization for Standardization (ISO) Guide 73 (2009), Risk Management Terminology, and its American National Standards Institute (ANSI) equivalent Z690.1 (2011). A future article will review the Principles and Guidelines ANSI/ASSE Z690.2 (2011) and Assessment Techniques ANSI/ASSE Z690.3 (2011) documents.

Research paper thumbnail of Reviews of Standards and Related Material*: Statistical Standards and ISO, Part 1

Quality Engineering, 2012

ABSTRACT In this article we review the scope, structure, and directions of the International Orga... more ABSTRACT In this article we review the scope, structure, and directions of the International Organization for Standardization (ISO) Technical Committee TC69 on international statistical standards. Since its creation in 1948, ISO TC69 has published over 100 international statistical standards with several renewed periodically with revisions. The collection of 104 currently published standards is reviewed, and several standards at the final draft international standard (FDIS) stage are identified. Future strategic directions of TC69 are anticipated. The present article and subsequent articles are intended to complement the four-part series of papers on “Statistical Standards and ASTM” recently published in Quality Engineering (Fortini and Luko 2011; Murphy et al. 2011; Neubauer and Luko 2011; Ullman and Luko 2010).The goal is to inform the readership of the useful contents of the standards and to invite participation from experts through their standards’ member bodies.

Research paper thumbnail of A Review of the Weibull Distribution and Selected Engineering Applications

SAE technical paper series, Sep 14, 1999

Research paper thumbnail of Risk Assessment Techniques

Quality Engineering, May 27, 2014

Research paper thumbnail of Concerning the Estimators R¯/d2And R¯/d2* in Estimating Variability in a Normal Universe

Quality Engineering, Mar 1, 1996

ABSTRACT In an ordinary X and R control chart, the process standard deviation may be estimated us... more ABSTRACT In an ordinary X and R control chart, the process standard deviation may be estimated using the average range divided by the constant d2. This statistic is typically used when the process is in a state of statistical control, follows the normal distribution, and there are 20 or more subgroups. In some applications involving control charts there are only a small number of subgroups available for estimating the standard deviation: In these cases, a modified version of d2 known as d*2 is in use. In this article, the estimator based on d*2 is shown to be superior in certain applications because it has a smaller mean square error, particularly for a small number of subgroups. A relationship between d2 and d*2 is presented and several of the elementary statistical properties are contrasted between the estimators R̄/d2 and R̄/d*2. In conclusion, some guidelines for use are suggested.

Research paper thumbnail of The “Coupon Collector's Problem” and Quality Control

Quality Engineering, Mar 13, 2009

Research paper thumbnail of Risk Management Principles and Guidelines

Quality Engineering, Oct 1, 2013

Research paper thumbnail of Reviews of Standards and Related Material: Statistical Standards and ISO, Part 2 — Terminology

Quality Engineering, Apr 30, 2012

Research paper thumbnail of Statistical Standards and ASTM

Quality Engineering, Aug 31, 2010

The ASTM Committee E11 on Quality and Statistics has produced a number of standards relevant to r... more The ASTM Committee E11 on Quality and Statistics has produced a number of standards relevant to readers of Quality Engineering. E11 develops standards through consensus among ASTM members and invited experts. E11 standards as of October 2010 include a t..

Research paper thumbnail of Comparing Acceptance Sampling Standards, Part 2

Quality Engineering, Apr 1, 2013

Research paper thumbnail of Statistical Standards and ASTM, Part 2

Quality Engineering, 2010

Research paper thumbnail of Risk Management Terminology

Quality Engineering, 2013

ABSTRACT Three new standards related to the risk concept appeared in January 2011. These standard... more ABSTRACT Three new standards related to the risk concept appeared in January 2011. These standards are an adoption by the American National Standards Institute (ANSI) of an ISO suite of documents developed in conjunction with the American Society of Safety Engineers (ASSE) concerning risk vocabulary, risk management, and risk assessment techniques. This article describes International Organization for Standardization (ISO) Guide 73 (2009), Risk Management Terminology, and its American National Standards Institute (ANSI) equivalent Z690.1 (2011). A future article will review the Principles and Guidelines ANSI/ASSE Z690.2 (2011) and Assessment Techniques ANSI/ASSE Z690.3 (2011) documents.

Research paper thumbnail of Statistical Standards and ISO, Part 2—Terminology

Quality Engineering, Apr 1, 2012

ABSTRACT This is the second article in a series reviewing statistical standards published under t... more ABSTRACT This is the second article in a series reviewing statistical standards published under the auspices of the International Organization for Standardization Technical Committee 69 on Applications of Statistical Methods. In this second article the emphasis is on terminology and nomenclature documents in the ISO 3534 series. In addition to reviewing these documents, a general discussion of lexicography is provided that reveals the deceptive difficulty in producing a coherent and comprehensive vocabulary for probability and statistics for use in international statistical standards.

Research paper thumbnail of Reviews of Standards and Related Material*: Statistical Standards and ISO, Part 1

Quality Engineering, 2012

ABSTRACT In this article we review the scope, structure, and directions of the International Orga... more ABSTRACT In this article we review the scope, structure, and directions of the International Organization for Standardization (ISO) Technical Committee TC69 on international statistical standards. Since its creation in 1948, ISO TC69 has published over 100 international statistical standards with several renewed periodically with revisions. The collection of 104 currently published standards is reviewed, and several standards at the final draft international standard (FDIS) stage are identified. Future strategic directions of TC69 are anticipated. The present article and subsequent articles are intended to complement the four-part series of papers on “Statistical Standards and ASTM” recently published in Quality Engineering (Fortini and Luko 2011; Murphy et al. 2011; Neubauer and Luko 2011; Ullman and Luko 2010).The goal is to inform the readership of the useful contents of the standards and to invite participation from experts through their standards’ member bodies.

Research paper thumbnail of Reviews of Standards and Related Material: Comparing Acceptance Sampling Standards, Part 1

Quality Engineering, 2013

In this first part of a two-part series, common attribute sampling standards are discussed and co... more In this first part of a two-part series, common attribute sampling standards are discussed and compared.

Research paper thumbnail of Metrics and Conversions for Process Quality

SAE technical paper series, Mar 19, 2002

Research paper thumbnail of Comparing Acceptance Sampling Standards, Part 1

Quality Engineering, Dec 1, 2012

Research paper thumbnail of “Zero Defects”, Statistically Considered

SAE technical paper series, Sep 11, 2000

Research paper thumbnail of Attribute Reliability and the Success Run: A Review

SAE technical paper series, Sep 8, 1997

Research paper thumbnail of Statistical Standards and ASTM, Part 2

Quality Engineering, Dec 3, 2010

Research paper thumbnail of Risk Management Terminology

Quality Engineering, Jul 1, 2013

ABSTRACT Three new standards related to the risk concept appeared in January 2011. These standard... more ABSTRACT Three new standards related to the risk concept appeared in January 2011. These standards are an adoption by the American National Standards Institute (ANSI) of an ISO suite of documents developed in conjunction with the American Society of Safety Engineers (ASSE) concerning risk vocabulary, risk management, and risk assessment techniques. This article describes International Organization for Standardization (ISO) Guide 73 (2009), Risk Management Terminology, and its American National Standards Institute (ANSI) equivalent Z690.1 (2011). A future article will review the Principles and Guidelines ANSI/ASSE Z690.2 (2011) and Assessment Techniques ANSI/ASSE Z690.3 (2011) documents.

Research paper thumbnail of Reviews of Standards and Related Material*: Statistical Standards and ISO, Part 1

Quality Engineering, 2012

ABSTRACT In this article we review the scope, structure, and directions of the International Orga... more ABSTRACT In this article we review the scope, structure, and directions of the International Organization for Standardization (ISO) Technical Committee TC69 on international statistical standards. Since its creation in 1948, ISO TC69 has published over 100 international statistical standards with several renewed periodically with revisions. The collection of 104 currently published standards is reviewed, and several standards at the final draft international standard (FDIS) stage are identified. Future strategic directions of TC69 are anticipated. The present article and subsequent articles are intended to complement the four-part series of papers on “Statistical Standards and ASTM” recently published in Quality Engineering (Fortini and Luko 2011; Murphy et al. 2011; Neubauer and Luko 2011; Ullman and Luko 2010).The goal is to inform the readership of the useful contents of the standards and to invite participation from experts through their standards’ member bodies.

Research paper thumbnail of A Review of the Weibull Distribution and Selected Engineering Applications

SAE technical paper series, Sep 14, 1999

Research paper thumbnail of Risk Assessment Techniques

Quality Engineering, May 27, 2014

Research paper thumbnail of Concerning the Estimators R¯/d2And R¯/d2* in Estimating Variability in a Normal Universe

Quality Engineering, Mar 1, 1996

ABSTRACT In an ordinary X and R control chart, the process standard deviation may be estimated us... more ABSTRACT In an ordinary X and R control chart, the process standard deviation may be estimated using the average range divided by the constant d2. This statistic is typically used when the process is in a state of statistical control, follows the normal distribution, and there are 20 or more subgroups. In some applications involving control charts there are only a small number of subgroups available for estimating the standard deviation: In these cases, a modified version of d2 known as d*2 is in use. In this article, the estimator based on d*2 is shown to be superior in certain applications because it has a smaller mean square error, particularly for a small number of subgroups. A relationship between d2 and d*2 is presented and several of the elementary statistical properties are contrasted between the estimators R̄/d2 and R̄/d*2. In conclusion, some guidelines for use are suggested.

Research paper thumbnail of The “Coupon Collector's Problem” and Quality Control

Quality Engineering, Mar 13, 2009

Research paper thumbnail of Risk Management Principles and Guidelines

Quality Engineering, Oct 1, 2013

Research paper thumbnail of Reviews of Standards and Related Material: Statistical Standards and ISO, Part 2 — Terminology

Quality Engineering, Apr 30, 2012

Research paper thumbnail of Statistical Standards and ASTM

Quality Engineering, Aug 31, 2010

The ASTM Committee E11 on Quality and Statistics has produced a number of standards relevant to r... more The ASTM Committee E11 on Quality and Statistics has produced a number of standards relevant to readers of Quality Engineering. E11 develops standards through consensus among ASTM members and invited experts. E11 standards as of October 2010 include a t..

Research paper thumbnail of Comparing Acceptance Sampling Standards, Part 2

Quality Engineering, Apr 1, 2013

Research paper thumbnail of Statistical Standards and ASTM, Part 2

Quality Engineering, 2010

Research paper thumbnail of Risk Management Terminology

Quality Engineering, 2013

ABSTRACT Three new standards related to the risk concept appeared in January 2011. These standard... more ABSTRACT Three new standards related to the risk concept appeared in January 2011. These standards are an adoption by the American National Standards Institute (ANSI) of an ISO suite of documents developed in conjunction with the American Society of Safety Engineers (ASSE) concerning risk vocabulary, risk management, and risk assessment techniques. This article describes International Organization for Standardization (ISO) Guide 73 (2009), Risk Management Terminology, and its American National Standards Institute (ANSI) equivalent Z690.1 (2011). A future article will review the Principles and Guidelines ANSI/ASSE Z690.2 (2011) and Assessment Techniques ANSI/ASSE Z690.3 (2011) documents.

Research paper thumbnail of Statistical Standards and ISO, Part 2—Terminology

Quality Engineering, Apr 1, 2012

ABSTRACT This is the second article in a series reviewing statistical standards published under t... more ABSTRACT This is the second article in a series reviewing statistical standards published under the auspices of the International Organization for Standardization Technical Committee 69 on Applications of Statistical Methods. In this second article the emphasis is on terminology and nomenclature documents in the ISO 3534 series. In addition to reviewing these documents, a general discussion of lexicography is provided that reveals the deceptive difficulty in producing a coherent and comprehensive vocabulary for probability and statistics for use in international statistical standards.

Research paper thumbnail of Reviews of Standards and Related Material*: Statistical Standards and ISO, Part 1

Quality Engineering, 2012

ABSTRACT In this article we review the scope, structure, and directions of the International Orga... more ABSTRACT In this article we review the scope, structure, and directions of the International Organization for Standardization (ISO) Technical Committee TC69 on international statistical standards. Since its creation in 1948, ISO TC69 has published over 100 international statistical standards with several renewed periodically with revisions. The collection of 104 currently published standards is reviewed, and several standards at the final draft international standard (FDIS) stage are identified. Future strategic directions of TC69 are anticipated. The present article and subsequent articles are intended to complement the four-part series of papers on “Statistical Standards and ASTM” recently published in Quality Engineering (Fortini and Luko 2011; Murphy et al. 2011; Neubauer and Luko 2011; Ullman and Luko 2010).The goal is to inform the readership of the useful contents of the standards and to invite participation from experts through their standards’ member bodies.