Experimental design and chemometrics in food - Prof. Marcello Mascini - a.a. 2017/2018
In his academic career Dr. Mascini has published more than 100 papers (70% as corresponding author) on international scientific journals (peer-reviewed) with an average Impact Factor of 3.2. For update details please visit the google scholar page: https://scholar.google.it/citations?user=APvh_ycAAAAJ&hl=en.
He actively participated in national and international scientific meetings with more than 200 posters or oral presentations (abstracts). Dr. Mascini research area was focused on the development of screening methods for fast and real time detection of analytes important for health and quality control analysis. The research interests were with a particular focus on new methods to develop bio-synthetic systems (biomimetic or bioinspired) in analytical application using molecular modeling and advanced multivariate systems.
ABOUT THE COURSE
OBJECTIVES OF THE COURSE
- Knowledge and understanding: The course aims to increase the knowledge of pre and post processing experimental data with multivariate statistical techniques applied to the analysis of foods.
This course will emphasize computer approaches to multivariate statistical analysis. We will discuss how to design, conduct, and analyze experiments in food sciences Various designs will be discussed and their respective differences, advantages, and disadvantages will be noted. We will examine techniques for data reduction (principal components, factor analysis, and cluster analysis) and for discrimination and classification (cluster analysis, discriminant analysis). In the first part the course will examine how to design experiments, carry them out, and analyze the data they yield. In the second part it will be compared univariate and multivariate statistical techniques (PCA and PLS). Case studies related to research projects will be taken as practical examples and they will be carried out by using academic free software
- Applying knowledge and understanding: This course gives the basis to planning experiments and analyzing complex Experimental Data with more than three variables at the same time.
The program will be elementary in terms of mathematics. The course includes a review of the multivariate background necessary for conducting and analyzing multidimensional scientific experimentation. With this background, we first discuss the logic of hypothesis testing and, in particular, the statistical techniques generally referred to as Analysis of Variance. We will work using add-in software packages in Excel environment.
Throughout the course, we emphasize applications, using real examples from the food areas, including such relatively new areas to solve problems in various contexts of the agri-food sector. The study of the multivariate statistical analysis will allow, for example, the classification of data independently of the development of methods.
- Making judgements: Students will be able to use a methodology that can be effective for general problem-solving, as well as for improving or optimizing product design and manufacturing processes. Students will work on demo programs or academic-free processing of advanced statistical models using data from the agri-food publications. The results will be presented in the form of reports which will highlight potential, limitations and possible developments of the work performed. Non-attending students will be asked to submit a report online evaluated by the teacher and the attending students.
- Communication: The oral presentation in form of report will help to develop effective communication that is the glue that helps connections to others and improve teamwork, decision making, and problem solving. The practical examples carried out during the course will enable to manage even negative or difficult problems without creating conflict or destroying expectations.
- Learning skills: At the end of the course, students will be able to design experiments, carry them out, and analyze the data they yield. Moreover students will able to examine how a rational design allows cost reduction, increases efficiency of experimentation, and reveals the essential nature of a process. Finally they will Learn the technique of regression analysis, and how it compares and contrasts with other techniques studied in the degree program.
PREREQUISITE AND PREPARATORY
- Prerequisite: elementary mathematics for learning statistical basis. In particular, it is necessary to have knowledge about the normal distribution of Gauss, variance and standard deviation calibration, regression, least squares, chi-square, measurement error, precision and accuracy
- Preparatory: No
UNIT 1: statistical regression
Data, information, models, data types, analytical representation of data
Calibration and regression, Introduction to Statistics
Average & Variance
The Normal distribution, theory of measurement errors, the central limit theorem and the theorem of Gauss
Maximum likelihood, method of least squares, Generalization of the method of least squares
Polynomial regression, non-linear regression, the χ2 method, Validation of the model
UNIT 2: Design of Experiments
Basic design of experiments and analysis of the resulting data
Analysis of variance, blocking and nuisance variables
Fractional factorial designs
Overview of other types of experimental designs (Plackett–Burman designs, D-optimal designs, Supersaturated designs, Asymmetrical designs)
Response surface methods and designs
Applications of designed experiments from various fields of food science
UNIT 3: Data Matrices and sensor arrays
Multiple linear regression
Principal component analysis (PCA)
Principal component regression (PCR) and Partial least squares regression - (PLS)
UNIT 4: Elements of Pattern recognition
The space representation (PCA)
Examples of PCA
Discriminant analysis (DA)
Examples of PLS-DA
Because of the practical application nature of this course there is no mandatory textbook. Instead, you should purchase a text that suits your needs (e.g., practical application versus mathematical statistics). Recommended texts are:
Johnson, Dallas E. (1998). Applied multivariate methods for data analysis. Pacific Grove, CA: Duxbury Press. Good balance between theory and practice.
Tabachnick, B. G. & Fideii,L.S. (2000). Using Multivariate Statistics, 4th Ed. New York: Allyn & Bacon. A traditional and popular text that focuses on practical applications.
Oehlert, Gary W. (2010). A first course in design and analysis of experiments. (http://users.stat.umn.edu/~gary/book/fcdae.pdf)
Barrentine Larry B. (1999) An Introduction to Design of Experiments: A Simplified Approach Amer Society for Quality
Slides of the lessons
Author: Dr. Mascini, Prof Sacchetti
Date: at the end of the unit
Test type: Multiple
choice questions (MCQs)
The tests are held during the semester at the end of the units and are a series of multiple choice questions, related to the specific arguments of the units. The correct answer to each question is 1 point. Wrong answer or no answer is 0 points. The maximum score evaluation is 25/30. It should be noted that to have 30/30 it is mandatory to do the report (see below).
In case of you can not do the tests during the course, you can do a final multiple choice quiz at the end of the semester.
The score obtained in the tests will be kept up for one year.
A presentation is requested in form of report which will highlight potential, limitations and possible developments of the work performed. Non-attending students are asked to submit a report online evaluated by the teacher and the attending students. The report is not mandatory but it allows to have an evaluation of 30/30 (with honors). If you don't do the report you will have a maximum evaluation of 25/30.
During the lessons, students can check their learning, through the online test simulator, similar to the examination tests.
The Teacher is available to answer questions at the end of
the lesson, or on request by e-mail (firstname.lastname@example.org)