The phrase "a specific index of" is correct and usable in written English.
It can be used when referring to a particular index that provides information or data about a certain subject or category.
Example: "The report includes a specific index of all the variables measured during the study."
Alternatives: "a particular index of" or "a defined index of".
Based on the frequency-tagged responses (SSEPs) to these rhythms, we computed a general index of neural entrainment to the beat and a specific index of neural activity to an endogenous beat for each individual participant.
The goal of an index fund is simply to match the performance of a specific index of stocks, such as the S&P 500, by investing in all of the companies within that index.
The tumor is proposed as a specific index of the harmfulness criterion of carcinogenic action.
Lacking a specific index of an individual's sun exposure, we examined time in hospital as a proxy measure.
Fast Fourier transformation was used to compute frequency domain parameters such as low frequency (LF = 0.04-0.15 Hz), which represents both sympathetic and parasympathetic activity, and high frequency (HF = 0.15-0.40 Hz), which is a specific index of parasympathetic activity.
Pooled analyses from environmentally diverse countries (USA, Australia, and Belgium) showed that motorized transport was negatively and linearly associated with a specific index of self-reported attributes of the neighbourhood environment (e.g. walking and cycling facilities, number of destinations, traffic safety).
The software also allows spell/run analysis to be performed and maps of a specific index to be constructed.
In order to estimate 'exposure to ethical conflict' we developed a specific index, the Index of Exposure to Ethical Conflict (IEEC), which yields a reference value for each subject.
These controls were screened for the absence of a history of diagnosed cancer prior to a specific index date, using records of the SCA.
The latter is a marker of macrophage/microglial phagocytic activity, thus a not specific index of M1/M2 activated cells.
Because tHcy levels increase in many settings, MMA was used as a more specific index of Cbl deficiency (3).
