The phrase "a more reliable indicator" is correct and usable in written English.
You can use it when comparing the reliability of different indicators or measures in a specific context.
Example: "In assessing the economic health of a country, GDP growth is often considered a more reliable indicator than unemployment rates."
Alternatives: "a better gauge" or "a more dependable measure".
Unlike CD11R1+ cells, health status did not affect the genetic and phenotypic relationships between AGP and weight gain, which might indicate that this is a more reliable indicator for selection purposes.
In estimating the physiological condition of the sample, the simultaneous selection of a group of genes indicative of a biological event is a more reliable indicator of that event than the selection of a single pertinent gene.
The national assessment is considered a more reliable indicator of performance.
Economists consider the seasonally adjusted number a more reliable indicator of the strength of the economy.
The national reading and math assessment is considered a more reliable indicator of performance than the state tests.
Economists consider the seasonally adjusted number to be a more reliable indicator of the strength of the economy.
Moreover, the payroll survey is much larger and thus a more reliable indicator of job market momentum.
Halifax said that monthly price movements can be volatile and quarterly changes can often be a more reliable indicator of the underlying direction of the housing market.
The cats, however, are turning down the opportunity to venture outside...and they are generally a more reliable indicator than the Met Service.
The Confederation of British Industry's retail survey, which has often proved a more reliable indicator, suggested that the growth-rate of retail sales slowed last month.
Such data is subject to seasonal adjustments and revisions, but the four-week moving average, considered a more reliable indicator, also declined.
