In a study of breathing and body movements in fetal lambs designed to examine possible changes in the amount and pattern of fetal activity during the last two-thirds of gestation, the numbers of movements by a fetal lamb observed through ultrasound were recorded. Changes in activity may be due to physical factors such as reduction in amniotic fluid volume and empty space within the uterus, or the development of the central nervous system.
This data set contains one particular sequence of counts from a single fetal lamb; it is a popular data set in the hidden Markov model literature.
This is a “1D” (vector) data set. The values are the number of movements over 240 consecutive 5-second intervals.
The data was originally described in
Leroux BG and Puterman ML (1992). Maximum-penalized-likelihood estimation for independent and Markov-dependent mixture models. Biometrics, 48: 545–558. https://doi.org/10.2307/2532308
I obtained the data from the label.switching R package.