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Statistical Analysis in Microbiology: StatNotes de Richard A. Armstrong, Anthony C. Hilton, 9780470559307, CIENCIAS BIOLÓGICAS | MATEMÁTICAS, biología | estadística, Wiley, Inglés

Statistical Analysis in Microbiology: StatNotes

Richard A. Armstrong, Anthony C. Hilton

EAN9780470559307

TématicaCiencias biológicas, Matemáticas

SubtématicaBiología, Estadística

EditorialWiley

IdiomaInglés

FormatoRústica   Año de publicación2010

 
This book is aimed primarily at microbiologists who are undertaking research, and who require a basic knowledge of statistics to analyse their experimental data. Computer software employing a wide range of data analysis methods is widely available to experimental scientists. The availability of this software, however, makes it even more essential that microbiologists understand the basic principles of statistics.
Statistical analysis of data can be complex with many different methods of approach, each of which applies in a particular experimental circumstance. In addition, most statistical software commercially available is complex and difficult to use. Hence, it is easy to apply an incorrect statistical method to data and to draw the wrong conclusions from an experiment.

The purpose of this book is an attempt to present the basic logic of statistics as clearly as possible and therefore, to dispel some of the myths that often surround the subject. The book is presented as a series of 2018Statnotes’, many of which were originally published in the 2018Microbiologist’ by the Society for Applied Microbiology, each of which deals with various topics including the nature of variables, comparing the means of two or more groups, non-parametric statistics, analysis of variance, correlating variables, and more complex methods such as multiple linear regression and factor analysis. In each case, the relevant statistical methods are illustrated with scenarios and real experimental data drawn from experiments in microbiology. The text will incorporate a glossary of the most commonly used statistical terms and a section to aid the investigator to select the most appropriate test.

Preface.
Acknowledgments.

Note on Statistical Software.

1 ARE THE DATA NORMALLY DISTRIBUTED?

1.1 Introduction.

1.2 Types of Data and Scores.

1.3 Scenario.

1.4 Data.

1.5 Analysis: Fitting the Normal Distribution.

1.6 Conclusion.

2 DESCRIBING THE NORMAL DISTRIBUTION.

2.1 Introduction.

2.2 Scenario.

2.3 Data.

2.4 Analysis: Describing the Normal Distribution.

2.5 Analysis: Is a Single Observation Typical of the Population?

2.6 Analysis: Describing the Variation of Sample Means.

2.7 Analysis: How to Fit Confidence Intervals to a Sample Mean.

2.8 Conclusion.

3 TESTING THE DIFFERENCE BETWEEN TWO GROUPS.

3.1 Introduction.

3.2 Scenario.

3.3 Data.

3.4 Analysis: The Unpaired t Test.

3.5 One-Tail and Two-Tail Tests.

3.6 Analysis: The Paired t Test.

3.7 Unpaired versus the Paired Design.

3.8 Conclusion.

4 WHAT IF THE DATA ARE NOT NORMALLY DISTRIBUTED?

4.1 Introduction.

4.2 How to Recognize a Normal Distribution.

4.3 Nonnormal Distributions.

4.4 Data Transformation.

4.5 Scenario.

4.6 Data.

4.7 Analysis: Mann–Whitney U test (for Unpaired Data).

4.8 Analysis: Wilcoxon Signed-Rank Test (for Paired Data).

4.9 Comparison of Parametric and Nonparametric Tests.

4.10 Conclusion.

5 CHI-SQUARE CONTINGENCY TABLES.

5.1 Introduction.

5.2 Scenario.

5.3 Data.

5.4 Analysis: 2 x 2 Contingency Table.

5.5 Analysis: Fisher’s 2 x 2 Exact Test.

5.6 Analysis: Rows x Columns (R x C) Contingency Tables.

5.7 Conclusion.

6 ONE-WAY ANALYSIS OF VARIANCE (ANOVA).

6.1 Introduction.

6.2 Scenario.

6.3 Data.

6.4 Analysis.

6.5 Assumptions of ANOVA.

6.6 Conclusion.

7 POST HOC TESTS.

7.1 Introduction.

7.2 Scenario.

7.3 Data.

7.4 Analysis: Planned Comparisons between the Means.

7.5 Analysis: Post Hoc Tests.

7.6 Conclusion.

8 IS ONE SET OF DATA MORE VARIABLE THAN ANOTHER?

8.1 Introduction.

8.2 Scenario.

8.3 Data.

8.4 Analysis of Two Groups: Variance Ratio Test.

8.5 Analysis of Three or More Groups: Bartlett’s Test.

8.6 Analysis of Three or More Groups: Levene’s Test.

8.7 Analysis of Three or More Groups: Brown–Forsythe Test.

8.8 Conclusion.

9 STATISTICAL POWER AND SAMPLE SIZE.

9.1 Introduction.

9.2 Calculate Sample Size for Comparing Two Independent Treatments.

9.3 Implications of Sample Size Calculations.

9.4 Calculation of the Power (P’) of a Test.

9.5 Power and Sample Size in Other Designs.

9.6 Power and Sample Size in ANOVA.

9.7 More Complex Experimental Designs.

9.8 Simple Rule of Thumb.

9.9 Conclusion.

10 ONE-WAY ANALYSIS OF VARIANCE (RANDOM EFFECTS MODEL): THE NESTED OR HIERARCHICAL DESIGN.

10.1 Introduction.

10.2 Scenario.

10.3 Data.

10.4 Analysis.

10.5 Distinguish Random- and Fixed-Effect Factors.

10.6 Conclusion.

11 TWO-WAY ANALYSIS OF VARIANCE.

11.1 Introduction.

11.2 Scenario.

11.3 Data.

11.4 Analysis.

11.5 Conclusion.

12 TWO-FACTOR ANALYSIS OF VARIANCE.

12.1 Introduction.

12.2 Scenario.

12.3 Data.

12.4 Analysis.

12.5 Conclusion.

13 SPLIT-PLOT ANALYSIS OF VARIANCE.

13.1 Introduction.

13.2 Scenario.

13.3 Data.

13.4 Analysis.

13.5 Conclusion.

14 REPEATED-MEASURES ANALYSIS OF VARIANCE.

14.1 Introduction.

14.2 Scenario.

14.3 Data.

14.4 Analysis.

14.5 Conclusion.

15 CORRELATION OF TWO VARIABLES.

15.1 Introduction.

15.2 Naming Variables.

15.3 Scenario.

15.4 Data.

15.5 Analysis.

15.6 Limitations of r.

15.7 Conclusion.

16 LIMITS OF AGREEMENT.

16.1 Introduction.

16.2 Scenario.

16.3 Data.

16.4 Analysis.

16.5 Conclusion.

17 NONPARAMETRIC CORRELATION COEFFICIENTS.

17.1 Introduction.

17.2 Bivariate Normal Distribution.

17.3 Scenario.

17.4 Data.

17.5 Analysis: Spearman’s Rank Correlation (?, rs).

17.6 Analysis: Kendall’s Rank Correlation (t).

17.7 Analysis: Gamma (?).

17.8 Conclusion.

18 FITTING A REGRESSION LINE TO DATA.

18.1 Introduction.

18.2 Line of Best Fit.

18.3 Scenario.

18.4 Data.

18.5 Analysis: Fitting the Line.

18.6 Analysis: Goodness of Fit of the Line to the Points.

18.7 Conclusion.

19 USING A REGRESSION LINE FOR PREDICTION AND CALIBRATION.

19.1 Introduction.

19.2 Types of Prediction Problem.

19.3 Scenario.

19.4 Data.

19.5 Analysis.

19.6 Conclusion.

20 COMPARISON OF REGRESSION LINES.

20.1 Introduction.

20.2 Scenario.

20.3 Data.

20.4 Analysis.

20.5 Conclusion.

21 NONLINEAR REGRESSION: FITTING AN EXPONENTIAL CURVE.

21.1 Introduction.

21.2 Common Types of Curve.

21.3 Scenario.

21.4 Data.

21.5 Analysis.

21.6 Conclusion.

22 NONLINEAR REGRESSION: FITTING A GENERAL POLYNOMIAL-TYPE CURVE.

22.1 Introduction.

22.2 Scenario A: Does a Curve Fit Better Than a Straight Line?

22.3 Data.

22.4 Analysis.

22.5 Scenario B: Fitting a General Polynomial-Type Curve.

22.6 Data.

22.7 Analysis.

22.8 Conclusion.

23 NONLINEAR REGRESSION: FITTING A LOGISTIC GROWTH CURVE.

23.1 Introduction.

23.2 Scenario.

23.3 Data.

23.4 Analysis: Nonlinear Estimation Methods.

23.6 Conclusion.

24 NONPARAMETRIC ANALYSIS OF VARIANCE.

24.1 Introduction.

24.2 Scenario.

24.3 Analysis: Kruskal–Wallis Test.

24.4 Analysis: Friedmann’s Test.

24.5 Conclusion.

25 MULTIPLE LINEAR REGRESSION.

25.1 Introduction.

25.2 Scenario.

25.3 Data.

25.4 Analysis.

25.5 Conclusion.

26 STEPWISE MULTIPLE REGRESSION.

26.1 Introduction.

26.2 Scenario.

26.3 Data.

22.4 Analysis by the Step-Up Method.

26.5 Conclusion.

27 CLASSIFICATION AND DENDROGRAMS.

27.1 Introduction.

27.2 Scenario.

27.3 Data.

27.4 Analysis.

27.5 Conclusion.

28 FACTOR ANALYSIS AND PRINCIPAL COMPONENTS ANALYSIS.

28.1 Introduction.

28.2 Scenario.

28.3 Data.

28.4 Analysis: Theory.

28.5 Analysis: How Is the Analysis Carried Out?

28.6 Conclusion.

References.

Appendix 1 Which Test to Use: Table.

Appendix 2 Which Test to Use: Key.

Appendix 3 Glossary of Statistical Terms and Their Abbreviations.

Appendix 4 Summary of Sample Size Procedures for Different Statistical Tests.

Index of Statistical Tests and Procedures

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