The phrase "ascertain from a" is correct and usable in written English.
It can be used when you want to indicate that you are trying to find out or determine information from a specific source.
Example: "You can ascertain from a reliable source whether the information is accurate."
Alternatives: "determine from a" or "find out from a".
The proposed statistical method can be modified to other population-based family data ascertained from a disease registry provided that the ascertainment process is well documented, and that external information concerning the sizes of birth cohorts and a suitable reference sample are available.
All but 1 of 112 first-episode psychosis cases ascertained from a geographical catchment area were traced at 10 12 years.
The paper also ascertains, from a value chain perspective, the extent of e-business usages within two export organizations in Ghana's Non-traditional Export (NTE) sector.
Expert panelists and a convenience sample of 95 community-based primary care physicians ranked items for (i) importance and (ii) feasibility of ascertaining from a typical office chart record.
Rules of thumb for preliminary design can be ascertained from a qualitative examination of the governing equations of flow, which elucidate the relationships between 'core' variables – flow rates, air temperatures, heat inputs and building geometry.
At least, that's what the guests at the back of the room thought they heard him say, which provoked perplexed mutterings and wary smiles until it was ascertained, from a listener with keener hearing, that what Hertog had actually said is that the books are almost all long.
and how can it be known without ascertaining, from a comparison with the constitution, whether there exist such an incompatibility between the acts of the legislature and the constitution, as to make void the acts?
In brief, schizophrenic patients were ascertained from a variety of inpatient and outpatient centers in south Minnesota.
U.S nativity was ascertained from a single question asking the respondent whether or not they were born in the U.S. Socioeconomic measures were taken from the Parental Questionnaire.
