The phrase "a useful size" is correct and usable in written English.
It can be used when describing an object or item that is appropriately sized for a particular purpose or function.
Example: "The container is a useful size for storing leftovers in the fridge."
Alternatives: "a practical size" or "an appropriate size".
It should show whether stellarators can be scaled up to a useful size.
This study shows that photo-cross-linking is an attractive option to stiffen the initial fibrin gel and thereby reduce cell-induced compaction, which can allow for longer incubation periods and thus more tissue growth without compaction below a useful size.
This was a useful size to identify many, but not all differentially expressed genes.
Therefore, the results could be visualized by the naked eyes because the small nano-gold particles could easily be grown to a useful size.
A 5-gallon bucket is a useful size, as are 1-cup measuring cups.
A fairly useful size and configuration might be about 19X29 inches.
The number of inbred lines that can capture the maximum number of alleles generally defines the most useful size for a core subset of the entire population [15].
When comparing means of continuous variables between two groups using a t test, Cohen's d is a useful effect size measure that describes the difference between the means normalized to the pooled standard deviation (SD) of the two groups (see Table 1; Cohen, 1988).
When comparing the distribution of a dichotomous variable between two groups, for instance, when using a χ test of homogeneity, the odds ratio is a useful effect size measure that describes the likelihood of an outcome occurring in the treatment group compared with the likelihood of the outcome occurring in the control group (see Table 1; Cohen, 1994; Thompson, 1996).
Three months was chosen as a compromise between providing a useful sample size and limited researcher resource.
Something must be done to curtail a financial sector that has grown beyond its "socially useful" size, he argues: if higher capital requirements don't do the trick, then something else must be tried.
