The phrase "a number of hierarchical" is correct and usable in written English.
It can be used when referring to multiple levels or layers within a structured system or organization.
Example: "The organization has a number of hierarchical structures that facilitate communication and decision-making."
Alternatives: "several hierarchical" or "multiple hierarchical".
The k-means clustering algorithm is compared with a number of hierarchical algorithms.
Products architecture consists of a number of hierarchical levels, which add a useful dimension to modularity analysis.
Tree species display different abundance patterns over the landscape due to a number of hierarchical factors, all of which have implications when modeling their distribution.
The mechanisms by which bone senses and responds to mechanical stimulation are complex and occur at a number of hierarchical levels.
Here they provide the stiff resilient part of many tissues, where the inherent strength of the collagen triple helix is translated through a number of hierarchical levels to endow that tissue with its specific mechanical properties.
EPs were produced and grouped into a number of hierarchical families.
To find reliable ways to group samples together, we investigated a number of unsupervised hierarchical clustering techniques that would be used to group together the metrics we had selected.
In order to test our hypothesis, a number of multilevel (hierarchical) logistic regressions were carried out using HLM 6.6 [ 44].
Current advances in nano- and bio-tribology reveal a growing number of hierarchical (multiscale) surfaces.
The element transverse displacement is described by four linear shape functions plus a variable number of hierarchical functions which are forms of Legendre orthogonal polynomials.
The FE-SEM images show a large number of hierarchical structures, each of which consists of arrays of small nanoplatelets which is similar to nanostring-cluster structure.
