Statistical Aspects of the Microbiological Examination of Foods

Statistical Aspects of the Microbiological Examination of Foods

2nd Edition - July 1, 2008

Write a review

  • Authors: Basil Jarvis, Basil Jarvis
  • eBook ISBN: 9780080559377

Purchase options

Purchase options
DRM-free (EPub, PDF, Mobi)
Sales tax will be calculated at check-out

Institutional Subscription

Free Global Shipping
No minimum order

Description

For many biologists, statistics are an anathema; but statistical analysis of quantitative and qualitative data is of considerable importance. Although spreadsheet software provides a diverse range of statistical tools, users are usually unsure which technique should be used. This book provides the basic statistical theory and practice to understand the types of tests frequently needed for the assessment of microbiological data. No prior knowledge of statistical techniques is required. Even when data can be given to a professional statistician for analysis, the microbiologist needs to have at least a general understanding of the underlying basis of statistical procedures in order to communicate effectively with the statistician. The book contains many worked examples to illustrate the use of the techniques and provides a plethora of references both to standard statistical works and to relevant original scientific papers on food microbiology.

Key Features

  • Basil Jarvis has had many years of experience in academic, research and industrial food microbiology and is a Past President of the Society for Applied Microbiology. He has published several edited books and more than 200 scientific articles concerned with food microbiology
  • NEW to this edition - chapters on Measurement Uncertainty in Microbiology, Statistical Process Control, Food Safety Objectives, Risk Assessment and Microbiological Criteria and a chapter on Validation of Microbiological Methods by Dr Sharon Brunelle, AOAC consultant
  • Includes additional figures and tables together with many worked examples to illustrate the use of specific procedures in the analysis of data obtained in the microbiological examination of foods

Readership

Microbiologists, food microbiologists, applied microbiologists, food scientists, food technologists, official analysts, environmental health officers.

Table of Contents

  • LIST OF TABLES

    LIST OF FIGURES

    LIST OF EXAMPLES

    PREFACE

    Chapter 1: INTRODUCTION

    Chapter 2: SOME BASIC STATISTICAL CONCEPTS

    POPULATIONS

    LOTS AND SAMPLES

    AVERAGE SAMPLE POPULATIONS

    STATISTICS AND PARAMETERS

    VARIANCE AND ERROR

    THE CENTRAL LIMIT THEOREM

    Chapter 3: FREQUENCY DISTRIBUTIONS

    TYPES OF FREQUENCY DISTRIBUTION

    STATISTICAL PROBABILITY

    THE BINOMIAL DISTRIBUTION (σ2 < μ)

    THE NORMAL DISTRIBUTION

    THE POISSON DISTRIBUTION (σ2 = μ)

    THE NEGATIVE BINOMIAL DISTRIBUTION (σ2 > μ)

    RELATIONSHIP BETWEEN THE FREQUENCY DISTRIBUTIONS

    TRANSFORMATIONS

    Chapter 4: THE DISTRIBUTION OF MICROORGANISMS IN FOODS IN RELATION TO SAMPLING

    RANDOM DISTRIBUTION

    REGULAR DISTRIBUTION

    CONTAGIOUS (HETEROGENEOUS) DISTRIBUTIONS

    EFFECTS OF SAMPLE SIZE

    Chapter 5: STATISTICAL ASPECTS OF SAMPLING FOR MICROBIOLOGICAL ANALYSIS

    ATTRIBUTES AND VARIABLES SAMPLING

    BINOMIAL AND TRINOMIAL DISTRIBUTIONS

    ACCURACY OF THE SAMPLE ESTIMATE

    ACCEPTANCE SAMPLING BY ATTRIBUTES

    ACCEPTANCE SAMPLING BY VARIABLES

    Chapter 6: ERRORS IN THE PREPARATION OF LABORATORY SAMPLES FOR ANALYSIS

    LABORATORY SAMPLING ERRORS

    DILUENT VOLUME ERRORS

    PIPETTE VOLUME ERRORS

    OTHER SOURCES OF ERROR

    CALCULATION OF THE RELATIVE DILUTION ERROR

    EFFECTS OF GROSS DILUTION SERIES ERRORS ON THE DERIVED COLONY COUNT

    Chapter 7: ERRORS ASSOCIATED WITH COLONY COUNT PROCEDURES

    SPECIFIC TECHNICAL ERRORS

    PIPETTING AND DISTRIBUTION ERRORS

    LIMITING PRECISION AND CONFIDENCE LIMITS OF THE COLONY COUNT

    GENERAL TECHNICAL ERRORS

    COMPARABILITY OF COLONY COUNT METHODS

    OVERALL ERROR OF COLONY COUNT METHODS

    Chapter 8: ERRORS ASSOCIATED WITH QUANTAL RESPONSE METHODS

    DILUTION SERIES AND ITS MOST PROBABLE NUMBER COUNTS

    MULTIPLE TEST DILUTION SERIES

    QUANTIFICATION BASED ON RELATIVE PREVALENCE OF DEFECTIVES

    SOME STATISTICAL ASPECTS OF MULTI-STAGE TESTS

    Chapter 9: STATISTICAL CONSIDERATIONS OF OTHER METHODS IN QUANTITATIVE MICROBIOLOGY

    DIRECT MICROSCOPIC METHODS

    Howard Mould Count

    INDIRECT METHODS

    Chapter 10: MEASUREMENT UNCERTAINTY IN MICROBIOLOGICAL ANALYSIS

    ACCURACY AND PRECISION

    MEASUREMENT UNCERTAINTY

    HOW IS UNCERTAINTY ESTIMATED?

    REPORTING OF UNCERTAINTY

    SAMPLING UNCERTAINTY

    THE USE OF UNCERTAINTY MEASURES IN ASSESSING COMPLIANCE

    Chapter 11: ESTIMATION OF MEASUREMENT UNCERTAINTY

    THE ‘GENERALIZED UNCERTAINTY METHOD’ (GUM) OR BOTTOM-UP PROCEDURE

    THE TOP-DOWN APPROACH TO ESTIMATION OF UNCERTAINTY

    ANALYSIS OF VARIANCE (ANOVA)

    ROBUST METHODS OF ANOVA

    MEASUREMENT OF INTERMEDIATE REPRODUCIBILITY

    ESTIMATION OF UNCERTAINTY ASSOCIATED WITH QUANTAL METHODS

    Chapter 12: STATISTICAL PROCESS CONTROL USING MICROBIOLOGICAL DATA

    WHAT IS SPC?

    TREND ANALYSIS

    TOOLS FOR SPC

    SETTING CONTROL LIMITS

    SHEWHART’S CONTROL CHARTS FOR VARIABLES DATA

    CONCLUSION

    Chapter 13: VALIDATION OF MICROBIOLOGICAL METHODS FOR FOOD

    THE STAGES OF METHOD DEVELOPMENT

    WHAT IS VALIDATION?

    FUTURE DIRECTIONS

    Chapter 14: RISK ASSESSMENT, FOOD SAFETY OBJECTIVES AND MICROBIOLOGICAL CRITERIA FOR FOODS

    FOOD SAFETY OBJECTIVES AND RISK ASSESSMENT

    MICROBIOLOGICAL CRITERIA

    THE RELEVANCE OF MICROBIAL MEASUREMENT UNCERTAINTY TO MICROBIOLOGICAL CRITERIA

    CONCLUSION

    INDEX

Product details

  • No. of pages: 336
  • Language: English
  • Copyright: © Academic Press 2008
  • Published: July 1, 2008
  • Imprint: Academic Press
  • eBook ISBN: 9780080559377

About the Authors

Basil Jarvis

Basil Jarvis
Prof. Basil Jarvis has held various academic and senior industrial research positions throughout his career as a food microbiologist. His work has taken him to many countries outside the UK including the USA, Scandinavia and South Africa. He has published widely on food quality and safety, including inhibition of microbes in food systems, microbial toxins in foods, rapid microbiological methods, and statistical aspects of food microbiology. For almost 40 years he has been a Visiting Professor at the University of Reading and for 20 years was an Honorary Professor of Life Sciences at the University of Surrey, where he established a WHO-sponsored graduate course in Food Microbiology for medical and veterinary practitioners.

He has served on numerous official advisory groups, including the statistics group of the AOAC Presidential Taskforce on ‘Best Practices in Microbiological Methods’. He is also a member of the ISO working group on Microbiological Statistics. He is a Past President and Honorary Member of the Society for Applied Microbiology, a Fellow of the Royal Society of Biology and a Fellow of the Institute for Food Science and Technology. Although now retired, he retains his interests in teaching students and considers statistics to be a relaxing hobby, especially when accompanied by a glass of fine wine!

Affiliations and Expertise

Department of Food and Nutritional Sciences, School of Chemistry, Food and Pharmacy, The University of Reading, UK

Basil Jarvis

Basil Jarvis
Prof. Basil Jarvis has held various academic and senior industrial research positions throughout his career as a food microbiologist. His work has taken him to many countries outside the UK including the USA, Scandinavia and South Africa. He has published widely on food quality and safety, including inhibition of microbes in food systems, microbial toxins in foods, rapid microbiological methods, and statistical aspects of food microbiology. For almost 40 years he has been a Visiting Professor at the University of Reading and for 20 years was an Honorary Professor of Life Sciences at the University of Surrey, where he established a WHO-sponsored graduate course in Food Microbiology for medical and veterinary practitioners.

He has served on numerous official advisory groups, including the statistics group of the AOAC Presidential Taskforce on ‘Best Practices in Microbiological Methods’. He is also a member of the ISO working group on Microbiological Statistics. He is a Past President and Honorary Member of the Society for Applied Microbiology, a Fellow of the Royal Society of Biology and a Fellow of the Institute for Food Science and Technology. Although now retired, he retains his interests in teaching students and considers statistics to be a relaxing hobby, especially when accompanied by a glass of fine wine!

Affiliations and Expertise

Department of Food and Nutritional Sciences, School of Chemistry, Food and Pharmacy, The University of Reading, UK

Ratings and Reviews

Write a review

There are currently no reviews for "Statistical Aspects of the Microbiological Examination of Foods"