discrimPwr {sensR} | R Documentation |
Computes the power of the hypothesis test of no sensory difference for any one of four methods: 2-AFC, 3-AFC, duotrio and triangle tests given the underlying sensory difference delta, the type I test level and the sample size.
discrimPwr(delta, sample.size, alpha = .05, method = c("duotrio", "threeAFC", "twoAFC", "triangle"))
delta |
The underlying sensory difference (non-negative) |
sample.size |
The sample size (a positive integer) |
alpha |
The type I level of the test (must be between zero and one) |
method |
The discrimination test protocol. Four allowed values:
"twoAFC" , "threeAFC" , "duotrio" ,
"triangle" |
The function uses one of the dedicated binomial families.
The power.
Rune Haubo B Christensen and Per Bruun Brockhoff
Brockhoff, P.B. and Christensen, R.H.B (2008). Thurstonian models for sensory discrimination tests as generalized linear models. Manuscript for Food Quality and Preference.
triangle
, twoAFC
,
threeAFC
, duotrio
,
discrim
, discrimSim
,
AnotA
, discrimSS
,
samediff
, findcr
## Finding the power of a discrimination test with a sensory delta of 1, ## a sample of size 30 and a type I level of .05: discrimPwr(1, 30, 0.05, "twoAFC") discrimPwr(1, 30, 0.05, "threeAFC") discrimPwr(1, 30, 0.05, "duotrio") discrimPwr(1, 30, 0.05, "triangle")