The phrase "add the interaction of" is correct and usable in written English.
It can be used when discussing the inclusion of an interaction effect in a statistical model or analysis.
Example: "In our analysis, we will add the interaction of age and income to better understand their combined effect on spending behavior."
Alternatives: "include the interaction of" or "incorporate the interaction of".
However, adding the interaction of group by engagement rating did not increase the model's predictiveness; indeed, the adjusted R2 was reduced by 0.01.
DVD Movie Guide's Colin Jacobson said the episode "maintained a nicely irreverent tone most of the time — irreverent enough to make it amusing, at least," and added: "The interaction of the Simpson and Bouvier families at dinner was terrific, and Bart's experiences on skid row made their point while they still managed to be pointed and clever.
We further add the interaction effect of excess cash in models (5 - 8).
To these constraints that apply to both public and private health service delivery structures, we should add the interaction between public and private supply of services in LMICs.
In Model 5, we added the interaction terms of urban/rural areas with the number of children based on Model 4. The effects of the number of children aged 0 have no significant differences between urban and rural areas, but the effects for those aged 1 to 5, those aged 3 to 12, and children aged 13 and older are all significantly different.
There are four models in this table; these consider treatment regimen, site, treatment regimen, and site, and adding the interaction terms of the two factors in each of Models 1, 2, 3, and 4 separately.
In model (3), the interaction term of excess cash remains be negative after adding the interaction terms of the E-index with pension ownership and industry competition.
If the interaction term was significant (P < 0.05) it was tested whether adding the interaction with square of gestational age was significant.
