Dr Hal MacFie

Consultant in Sensory & Consumer Science

Hal MacFie Training Services
Company Registration No: 7864651
Company Address: 43 Manor Road
Keynsham, Bristol BS31 1RB, UK
Contact Tel: (44) 0117 9863590

About Us!

The How and Why of Discrimination and Sensory Claims Tests

Anne Hasted

November 19th 2018
Cliftons Melbourne
440 Collins Street
Melbourne VIC 3000

Course Organiser
Hal MacFie
For details and registration e-mail:

In our experience many discrimination/similarity tests are designed around practical constraints (cost/availability) rather than on sound statistical principles. This workshop highlights the risks involved in this strategy, looks at methods for defining similarity/difference thresholds and test methods and analysis for robust sensory claims testing.

Workshop outline

  • Quantifying test risks
  • Importance of looking at confidence intervals as well as significance tests
  • Are Difference/Similarity Tests the same?
  • Comparison of different methods particularly Triangle v Tetrad
  • How to quantify a difference – proportion of distinguishers v d-prime? What are the advantages of each?
  • How to calibrate your tests v consumer acceptability? What level of difference is acceptable.
  • Replicating to increase sample size – is it OK?
Making sensory claims – does your data support your claim? Is your data robust enough?


Anne Hasted began her career as an academic statistician at Reading University, she is now the senior consultant at Qi Statistics Ltd offering statistical training, software and consultancy support to research and industry. She has wide training and consultancy experience in both sensory and consumer research and has an international reputation for “user friendly” training.



Introduction. Statistical model behind difference tests, concepts of type 1 and type 2 risks and their importance in defining sample size. The importance of looking at confidence intervals as well as significance


Practical – comparing triangle and tetrad tests. Discussion on relative merits


Defining difference – proportion of detectors v “d-prime”. Thurstonianmodelling


Calibrating discrimination difference measures v consumer acceptability


Replicating to increase number of responses – OK or not? Testing independence using the beta-binomial distribution


Design of tests for sensory claims testing, parity v superiority.The regulatory framework


Important considerations and safeguards in analysis of sensory  and preference claims


Case study and discussion



Course Venue

Cliftons Melbourne
440 Collins Street
Melbourne VIC 3000


The course will run at Clifton’s “state of the art facility” in the heart of Melbourne’s CBD. For more details of the venue please visit

Yes: Please enrol me in Discrimination and Sensory Claims Tests Melbourne 19 November 2018

There is also the option to attend the course virtually from the comfort of your home or office for an additional fee of $150 (to cover the virtual set up and postage of training material)

Attendance Fee:

US$ 750

Includes lunch and course materials.

Virtual Training:

US$ 150

Live training event

Virtual Training Room

Attend any of our training courses from the comfort of your home or office.  Experience all the benefits of instructor-led training without the hassle of travelling. With Virtual Training Room, you can join a live training event from any location, whether you’re in a cube at work or at home, you’ll feel as if you are physically present in the classroom. Advanced classroom technology enables our presenters to deliver the same live instruction, whether you’re onsite and offsite. Please contact the course leader for more information.

This year we are running three one day courses at the Cliftons venue in Melbourne. As a special concession we are offering a 10% discount when you register for 2 courses and a 15 % discount if you register for all three. If you are considering attending more than one course then please contact us directly and we will take the payment and apply the discount. Contact

Course Registration Fees



Number of Places

Attendance Fee

US$ 750

Vitual Training

US$ 150

Total: $

    Payments and Refund Policy    

For electronic bank transfers: contact for IBAN details
Mailing address for registration and payment:
Dr H J H MacFie
43 Manor Road
Keynsham, Nr Bristol,
BS31 1RB, United Kingdom

Tel/Fax +44(0)1179863590

Electronic registration forms to