The phrase "a constant proportion of" is correct and usable in written English.
It can be used when discussing a fixed ratio or relationship between two quantities that remains unchanged over time.
Example: "The company aims to maintain a constant proportion of its revenue allocated to research and development."
Alternatives: "a fixed ratio of" or "an unchanging percentage of".
Adjusted Ebitda remained at a constant proportion of revenues: $160 million, or 25% of revenue, versus $117 million for Q1 2014, also 25% of revenue.
Europe, the most central (as measured by weighted eigenvector centrality), showed a constant proportion of bandwidth directed within the continent over the period.
The main drawback of this methodology now, is that the pushover curve is drawn on the basis that the element stiffnesses are assumed strength independent, equal to a constant proportion of the gross section stiffness, regardless of the reinforcement content.
So far I have assumed that government spending represents a constant proportion of GDP and that it is neither productive nor enters households' preferences: two assumptions often made in model economies focusing on taxation issues.
A specification including income in logs, for instance, assumes not only decreasing returns to income in terms of welfare but also that the cost of disability is a constant proportion of income.
Rumen fermentation parameters and fractional passages (solid and liquid) rates support the reduction in dC, N retention, and microbial protein synthesis observed as more dietary fiber is added to the rations of dairy heifers precision-fed a constant proportion of rumen-degradable protein.
Owing to sparse data, we used a constant proportion for expression of these tumour markers across all ages at diagnosis of breast cancer.
A government sector is introduced in the following way: it taxes capital and labor incomes with the same tax code, capital depreciation is completely deductible, and tax revenues are used to finance an exogenous stream of public expenditure, (G_t ), which (for the sake of analytical convenience) is expressed as a constant proportion, (gamma >0), of aggregate output (i.e. (G_t =gamma Y_t)).
Bark proportion rapidly decreases with an increasing diameter reaching a more constant proportion of 20%% decreasing to 10 % above diameters of approximately 8 cm.
Nevertheless, only one fourth or less of all SCs in milk was obtained in the precipitated pellet (Prescott and Breed 1910 ), and whether the small fraction in cell pellet has a fairly constant proportion of whole cells is still a question.
We also assumed that a constant proportion per unit time of the lead present in the blood was lost to another compartment, such that the amount in the blood would decline by a proportion (1−exp −k2)) per day in the absence of absorption.
