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Discover LudwigThe phrase "a direct index" is correct and usable in written English.
It can be used in contexts related to data organization, referencing, or cataloging where a straightforward or immediate reference point is needed.
Example: "The database features a direct index that allows users to quickly locate the information they need."
Alternatives: "an explicit index" or "a straightforward index".
Exact(17)
For this instrument, cold water was added to water in a vessel until dew formed on the vessel, and the temperature of the vessel, the dew point, provided a direct index of humidity.
The cortical thickness represents a direct index of atrophy caused by dementia and can be used in dementia diagnosis.
In contrast, WHO grade is a direct index of the malignancy grade, based on the consideration of various pathological factors, including the presence of necrosis, nuclear polymorphism, microvascular proliferation, mitotic activity, etc.
This assay measures cellular DNA content as a direct index of cell proliferation.
The number of beam breaks in this case can be correlated with the walking distance (cm) and provides a direct index of locomotion.
Additionally we found among all calls a positive correlation between the left turning bias in the head orienting response (right hemisphere activation) and the behavioural score of reactivity, which is a direct index used to express the fear and emotional state of the dog [8], [34].
Similar(43)
Let {C a }a∈Γbe a nonincreasing family of nonempty, convex, ρ-closed ρ-bounded subsets of L p, where Γ is a directed index set.
Let (X β )β∈Γbe a decreasing family of nonempty complete lattice subsets of X, where Γ is a directed index set.
Moreover, although negative self-views are an important feature of depression (e.g., Beck 1967), a more direct index of children's self-views is their sense of global self-worth (general self-esteem).
To obtain a more direct index of whether words are used to speak about emotions, we administered explicit semantic ratings of emotion-relatedness (Question: "Is this word typically used to speak about an emotion?"), in addition to standard arousal and valence ratings.
The SF-6D is a widely used direct index (e.g. not mapped via EQ-5D) which as with the EQ-5D is also based on respondent preferences [ 31].
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com