Faces: Perceived kinship in image pairs of children
In MPDiR: Data sets and scripts for Modeling Psychophysical Data in R.

Description Usage Format Details References Examples

Observers rated relatedness of pairs of images of children that were either siblings or not.

1	data(Faces)

A data frame with 960 observations on the following 6 variables.

SimRating: a numeric vector containing integer values from 0–10 indicating the observers confidence rating that the pair of images were sibilings or not.
sibs: a factor with levels 0 1, indicating whether the pair of images was, in fact, not related or related as siblings, respectively.
agediff: a numeric vector indicating the age difference between the face pairs in months.
gendiff: a factor with levels diff same indicating whether the images were of the same of different gender.
Obs: a factor with levels S1–S32 coding the identities of individual observers.
Image: a factor with levels Im1–Im30 coding the image pairs of the stimulus set.

Observers used an 11–point scale (0–10) to rate their confidence in whether the image pairs were of siblings.

Maloney, L. T., and Dal Martello, M. F. (2006). Kin recognition and the perceived facial similarity of children. Journal of Vision, 6(10):4, 1047–1056, http://journalofvision.org/6/10/4/.