Chunk #34 — Empirical Example Using Data from the NICHD Child Care Study — GXE Results — Standard equations

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Distinguishing ordinal and disordinal interactions.

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First, we fit Equation 11 with raw-scored predictors (see left part of Table 1). The X1-by-group interaction was significant, B̂3 = 17.51 (SE = 6.23), p < .006. The cross-over point was estimated as Ĉ = −(−47.95)/17.51=2.74, using Equation 4.