In this specific variant of segmental polynomial regression, the quadratic-plateau model, a quadratic curve is fit to the early data and a flat line (plateau) to the later data.
This model allows a quadratic regression curve to be fit to the early data and a flat line (plateau) to the later data thus allowing the model to predict the exact point of plateau in the learning curve as it describes how many subjects were needed before the sonographer achieved a stable within-subject variance.
The questionnaires have had similar overall content across the ages, but they have been generally expanded in the later data collections, and have also been revised to make them appropriate for the respective ages.
This may also reflect the same issue as noted previously, that the oldest children were engaged in exams during the later data collection and Web use is likely to be one of the primary uses of screen when at school.
This is likely due to the increase in geomagnetic activity in the later data around solar maximum (approximately 2014).
Given the substantial difference between the association in the earlier and later data (ORs of 2.7 vs. 1.4), and its marginal statistical significance, we recommend interpreting this result with caution.
Now, a year and a half later, data from the auspicious encounter show that minke whales have staked out a unique ecological niche that no other baleen whale can take advantage of: hunting krill under sea ice.
Invernizzi and colleagues reported age-dependent enhanced monosomy X in the peripheral white blood cells of women with PBC [ 84], and later data suggested that the X chromosome loss is preferential (that is, it more commonly involves the paternal or maternal chromosome) [ 85].
An arthrogram was taken to document needle placement, joint selection, and for later data analysis.
The use of both types of microarrays facilitated transcriptome comparison between apple and tomato (for the later using data previously published and available at the TED: tomato expression database) and highlighted genes conserved during ripening of both species, which in turn represent a foundation for further comparative genomic studies.
