The phrase "a specified proportion" is correct and usable in written English.
It can be used when referring to a particular fraction or percentage of a whole that has been clearly defined or determined.
Example: "The study found that a specified proportion of participants reported improved health outcomes after the intervention."
Alternatives: "a defined percentage" or "a designated fraction".
Among the new measures were mandatory minimum sentencing laws, which required inmates to serve a specified proportion of their time behind bars; truth-in-sentencing laws, which required an inmate to actually serve the time he was sentenced to; and a variety of three-strikes laws increasing the penalties for repeat offenders.
Type-I error rates are estimated by setting the locus heritability to zero, and power is estimated by setting it to a specified proportion, e.g., 0.5%.
SSDs can be used to calculate the concentration at which a specified proportion of species are expected to suffer toxic effects.
On the other hand, the health workforce budget might include resources for workshops and meetings, for example, without having a specified proportion for human resources within these lump sums.
As used in this project, a population threshold is an estimate of a biological threshold for a specified effect that holds for a specified proportion of a defined population.
When sequences are simulated with a specified proportion of invariable sites, the branch lengths specified by the user are rescaled (increased) by the program to compensate for the proportion of invariable sites.
Procedure for estimating the probability of portfolio losses exceeding some specified proportion based on a statistical analysis of historical market price trends, correlations, and volatilities.
The intra-method TDI is interpreted as the boundary at which the specified proportion of the replicated measurements are furthest from themselves.
The inter-method TDI is interpreted as the boundary at which the specified proportion of the average of the replicated measurements from one device are furthest from the average of the replicated measurements of the other device.
Our proposal for inference about the TDI estimate is based on tolerance intervals (TI), provided that we estimate the TDI by deriving the limits of a probability interval that contains a specified p-proportion of the resulting estimated normal distribution.
Avram et al. [4] studied the joint ruin problem for two insurance companies that divide between claims and premia in some specified proportions.
