"have most effect" is a correct and usable phrase in written English.
It means to have the most influence or impact on something or someone. Example: The new policies put in place by the government are expected to have the most effect on the economy.
In an opinion piece in the Australian Financial Review, the Grattan Institute's chief executive, John Daley, noted the proposed $25,000 annual cap on pre-tax super contributions would have most effect on older men with higher incomes.
In Oosting Lecture, John Terborgh Asks: Which Processes Have Most Effect on Species Diversity: Top-down or Bottom-up?
Against this background, in-depth elucidation of the economic factors driving emission rise in each nation would help identify key suppliers and demanders where system decarbonization would have most effect.
Regarding xylanase gene expression, the overexpression of gene 77513 (pMH15) seemed to have most effect on xyn3, whereas the two other candidate regulatory genes were more specific to xyn1 (only xylanase gene with improved expression by pMH20).
The co-author of the study, Richard Petty, said that previous research had indicated that majority opinion had most effect when they have little invested in the subject at hand.
As much as 80% of Caribbean coral is reckoned to have been lost in recent years, but the survey should give a more accurate picture of where the losses have had most effect and on the causes.
It was found that in GA, the variations in population size, creation function, crossover fractions and mutation scale had most effect on fitness function while number of generation had minimum effect on it.
Weighting of the prognostic factors has most effect on the extent to which the 15-category factor has a similar distribution for the 2 treatment groups.
In particular we were confident of the values of the parameters which had most effect on the model behaviour such as p53 and Mdm2 turnover rates.
The results showed that borehole pressure, permeability, borehole elevation and porosity have most significant effect in order of magnitude respectively.
An ASF epidemic in the region would have most catastrophic effects in the pork supply and protein availability worldwide.
