The different quantities are unitless.
Masking of patients and caregivers is not possible due to the different quantity of home visits between intervention and control group.
Beyond the fundamental problem of the different spatial and temporal scales analysed, it is necessary to notice that there is not a one-to-one correspondence between the different physical quantities.
This may involve mathematical manipulations different from those used in the reference algorithm (i.e. one written in a dictionary specifically to demonstrate the relationships between different quantities).
In many engineering situations, we are interested in finding the correlation ρ between different quantities x and y based on the values xi and yi of these quantities measured in different situations i. Measurements are never absolutely accurate; it is therefore necessary to take this inaccuracy into account when estimating the correlation ρ.
Then, in the Food condition, preference transitivity was tested by presenting capuchins with binary choices between different quantities of the three foods, labeled A, B and C in decreasing order of preference (Table 1, Video S1, S2, S3, S4).
Finally, in the Token condition, preference transitivity was tested by presenting capuchins with binary choices between different quantities of the three tokens, labeled A, B and C in decreasing order of preference (Table 1, Video S5, S6, S7, S8, S9, S10).
Indeed, in order to choose between different quantities of tokens corresponding to qualitatively different foods, capuchins should recall the association between each token and the corresponding food, evaluate the amount of each token array, estimate the relative value of the two offers, and finally make up their mind on which option to choose.
In each session, capuchins faced binary choices between different quantities of a pair (A B or B C).
