Table 2.

Possible Relations among Level, Velocity, and Acceleration of Two Constructs with Sample Questions using the Example of Mother’s Depression and Child Behavior Problems

		Construct 2
		Level	Velocity	Acceleration
	Level	Level-Level: Are high levels of maternal depression observed with high levels of child behavior problem?
Construct 1	Velocity	Velocity-Level: Is a mother’s level of depression, regardless of whether her symptoms are changing or not, related to the rate at which her child’s behavior problems increased or decreased (velocity)?	Velocity-Velocity: Does the rate at which mother’s depressive symptoms increase or decrease (velocity) predict the rate at which her child’s behavior problems increase or decrease (velocity)?
	Acceleration	Acceleration-Level: Does the mother’s level of depression predict increases or decreases in the rate of change of her child’s behavior problems (changes in velocity, acceleration)?	Acceleration-Velocity: Does the rate at which a mother’s depression improves or worsens (velocity) predict increases or decreases in the rate of change of her child’s behavior problems (changes in velocity, acceleration)?	Acceleration-Acceleration: Do increasing or decreasing rates of change in maternal depression (changes in velocity, acceleration) predict increases or decreases in the rate of change of her child’s behavior problems (changes in velocity, acceleration)?