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Youden Plots

What is a Youden plot? Youden (1959) developed a procedure for representing data produced by N laboratories for two similar materials A and B (they can be identical when we want to compare measurement methods, or different but expected to give identical values). The objective here is to simply identify which laboratories are problematic, either because the two measurements performed show an abnormal...

Principal Coordinate Analysis in Excel tutorial

CATA data analysis

What is CATA (check-all-that-apply) analysis? CATA (check-all-that-apply) surveys have become more and more popular for sensory product characterization since 2007, when it was presented by Adams et al. CATA surveys allow to focus on consumers, more representative of the market, instead of trained assessors. They are easy to set up and easy for participants to answer. The principle is that each assessor...

ANOVA (Analysis of variance)

Principles of the Analysis of Variance Analysis of variance (ANOVA) is a tool used to partition the observed variance in a particular variable into components attributable to different sources of variation. Analysis of variance (ANOVA) uses the same conceptual framework as linear regression. The main difference comes from the nature of the explanatory variables: instead of quantitative, here they...

Mann-Kendall Trend Tests

What is the Mann-Kendall test Mann-Kendall trend test is a nonparametric test used to identify a trend in a series, even if there is a seasonal component in the series. Mann-Kendall test history This test is the result of the development of the nonparametric trend test first proposed by Mann (1945). This test was further studied by Kendall (1975) and improved by Hirsch et al (1982, 1984) who allowed...

Create & run a Generalized Structured Component Analysis (GSCA) model

Statistical Power for ANOVA / ANCOVA / Repeated measures ANOVA

Statistical Power for ANOVA, ANCOVA and Repeated measures ANOVA XLSTAT offers tools to apply analysis of variance (ANOVA), repeated measures analysis of variance and analysis of covariance (ANCOVA). XLSTAT-Power estimates the power or calculates the necessary number of observations associated with these models. What is statistical power for ANOVA, ANCOVA and Repeated measures ANOVA? What is statistical...

DoE for conjoint analysis

Why do we use design of experiments for conjoint analysis The principle of conjoint analysis is to present a set of products (also known as profiles) to the individuals who will rank, rate, or choose some of them. In an ideal analysis, individuals should test all possible products. But it is soon impossible; the capacity of each being limited and the number of combinations increases very rapidly with...

Run Correlated Component Regression (CCR) in Excel

Penalty analysis

What is penalty analysis Penalty analysis is a method used in sensory data analysis to identify potential directions for the improvement of products, on the basis of surveys performed on consumers or experts. Two types of data are used: Preference data (or liking scores) that correspond to a global satisfaction index for a product (for example, liking scores on a 9 point scale for a chocolate bar),...