"categorically conclude" is correct and usable in written English.
You may use it to indicate certainty or finality when making a conclusion. For example: "After reviewing all of the available evidence, I can categorically conclude that the defendant is guilty."
After studying this report and other related studies, an expert group appointed by the government of India categorically concluded in February 2003 that "there is no link established between use of endosulfan in PCK [Plantation Corporation of Kerala] plantations and health problems reported in Padre village" (Central Insecticides Board and Registration Committee 2003).
Furthermore, gradual change, even through speciation, means that species will not be categorically distinct (criterion 6), which for Ellis (2001) is an additional reason to conclude that species are not natural kinds.
We conclude that although there may be some imprecision and upward bias in the field-measured BLL values, these are not likely to substantially affect the relative distribution, categorically high magnitude, or clinical importance of lead intoxication in this village.
We conclude that there is a non-linear relationship between age and HRQoL in patients receiving THR that results in residual confounding if treated as a simple linear term or categorically in the regression.
It concluded: "We also categorically state that we have never entered into any contract or engaged in any project with the intention of weakening RSA's products, or introducing potential 'backdoors' into our products for anyone's use".
As a result, the National Portrait Gallery concluded, "It can be categorically stated that Flower portrait of Shakespeare is a 19th-century painting".
Despite concluding that some form of change was necessary, the inquiry categorically stated that any changes "is at the present time and in present circumstances impracticable".
In the fall of 2012, an external committee convened by IBt concluded that modifications in at least two of the 11 articles were "inappropriate and categorically reprehensible," according to a memo circulated publicly by IBt.
In the third and concluding part of the discussion, (K 1 90) the sage acknowledges that he is not saying categorically that the matter took place just as he described.
Brendan Rodgers, who categorically stated he had no interest in the problematic striker less than three weeks ago, performed the volte-face after concluding Milan's £16m asking price was too tempting to refuse.
