'secondary indicator' is correct and usable in written English.
You can use it when referring to a sign or measure used to confirm or establish the accuracy of something else. For example, "Stock prices are a primary indicator of economic health, but consumer confidence surveys are a secondary indicator."
A secondary indicator employed to evaluate water quality is heterotrophic plate count (HPC).
Our protocol's inclusion of risk as a secondary indicator was therefore important for resisting this attack.
Thus, a high blood level of glucose is used as secondary indicator of stress (Barreto and Volpato 2006).
The same landscapes were classified ecologically by the range ecologist using soils and vegetation as a secondary indicator (see Berlin 1973).
Based on a semi-quantitative approach pollen of secondary indicator species and arboreal pollen values were combined in a fuzzy model to assess the intensity of herding-related vegetation changes.
(3) Based on the analysis of the carrying capacity of the secondary indicator contribution rate, the population pressure and the external contribution ability are nearly below 10%, and environmental pollution is also a critical indicator.
The indicator system comprises seven primary indicators and twenty-seven secondary indicators.
An index system comprising four primary indicators and 47 secondary indicators was constructed for earthquake emergency and rescue, based on recent earthquake disaster relief cases, relevant Chinese policies and regulations, and recent literature.
With results confirming our hypotheses, we contribute to the literature of impact studies by proposing RICV as new secondary indicators to estimate the economic impact of public-funded technological innovation at the firm, industry and national levels.
Note that this model exemplifies an extension of the conversation to secondary indicators, such as Sea_temp and Sea_state, in relation to which observations of above ambient temperature or of bubbling are presumed to be evidence of elevated (submarine) gas output.
Polo et al. (1998) have shown poor to no correlation between E. coli and Salmonella spp. to FC. Hörman et al. (2004) reported that there was no correlation between E. coli and Campylobacter spp. Enterococci bacteria have been considered useful as secondary indicators of faecal contamination (APHA 1998).
