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klaar
2003 Jan 20
1
quadratic trends and changes in slopes
...elp is appreciated.
Thanks.
FWIW, here's the description from one paper using this method:
"For both conditions, the subitizing range for each group was established
using quadratic trend tests on the aggregated RT data for numerosities 1-3,
1-4, and so on (Akin and Chase, 1978; Chi and Klahr, 1975; Pylyshyn,
1993). For both groups the first appearance of a quadratic trend was in
the N=1-5 range (t(9) = 7.33, p< .001 for the control group, and t(5) =
5.35, p = .005 for the Turner group). This indicates a subitizing range
of 4 for both groups. This divergence from a linear increase in...