Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/53069
Title: The split plot with repeated randomised complete block design can reduce psychological biases in consumer acceptance testing
Authors: Wannita Jirangrat
Jing Wang
Sujinda Sriwattana
Hong Kyoon No
Witoon Prinyawiwatkul
Keywords: Agricultural and Biological Sciences
Engineering
Issue Date: 1-Apr-2014
Abstract: A randomised complete block design (RCBD) has been extensively used in consumer testing; however, it is ineffective in preventing sample presentation biases. This study demonstrated a more efficient experimental design [i.e. split plot with repeated randomised complete block design (SPRRCBD)] to help minimise positional and first serving-order (FSO) biases in consumer tests. Results suggested that positional biases were strongly pronounced for the poor-quality sample. Comparing between RCBD and RCBD without FSO experiments, there were significant differences in overall liking (OL) scores of the same sample served at the same position. Hence, omitting the first sample score from data analysis was not recommended. The mean-squared error (MSE) of SPRRCBD was lower than RCBD and RCBD without FSO (2.28, 2.72 and 2.60, respectively), indicating a more powerful design to explain variations in mean hedonic differences. SPRRCBD extracted more explained variances, resulting in a decreased Type-II error in the model. © 2013 Institute of Food Science and Technology.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84900653613&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/53069
ISSN: 13652621
09505423
Appears in Collections:CMUL: Journal Articles

Files in This Item:
There are no files associated with this item.


Items in CMUIR are protected by copyright, with all rights reserved, unless otherwise indicated.