The phrase "ascertains the two" is correct and usable in written English.
It can be used in contexts where someone is determining or verifying two specific items or pieces of information.
Example: "The researcher ascertains the two variables that significantly impact the outcome of the experiment."
Alternatives: "determines the two" or "verifies the two".
The predictive ability did not improve with any extension of the lookback period for ascertaining the two diseases (all P > 0.29), and the C-statistic remained about the same (0.624) for models using hospital records from lookback periods of 'Pregnancy'2 '2 years', '3 years', '4 years' and '5 years'.
We ascertained the five comorbidities using validated registries based on hospital discharge abstracts and physician service claims in Ontario [see Supplemental Material, Comorbidity Ascertainment, pp. 3 4 (http://dx.doi.org/10.1289/ehp.1205958)] (Gershon et al. 2009a, 2009b; Lee et al. 2003; Tu JV et al. 2001; Tu K et al. 2008).
One of those came from a colleague at Salesforce where I could ascertain the first twenty or so names followed by a mysterious 109 others.
Prison authorities ascertained that the two had never been housed in the same section, and precautions were taken to keep them separate "to preserve the integrity" of Mr. Harris's statement, Mr. Salpeter said.
Lastly, we used a spike width measure43 to compute the proportion of putative pyramidal cells (broad spiking neurons) and putative interneurons (narrow spiking neurons) in the different neuronal subpopulations in order to ascertain whether the two segregated populations corresponded to two distinct neuronal subtypes.
Mr. Phillips asked that the trial be adjourned to enable him to investigate further to ascertain whether the two de fendants were "wilfully ab sent". However, after some discussion, both sides agreed to the suggestion of Justice Murtagh that the trial proceed.
His two beliefs directly contradict one another, and yet he is not guilty of any sort of failure of rationality; it is impossible for him to ascertain that the two beliefs are contradictory.
The average time spent and out-of-pocket expenditures were ascertained for the two types of visits from the start of out-patient treatment until the date of interview.
In order to test the hypothesis that the mutator genotype is more likely to produce cheats with a high fitness relative to the cooperative ancestral genotype, it is useful to ascertain whether the two strains differ in a) the variance in relative fitness among cheat clones and b) their median relative fitness.
