The phrase 'group of methods' is correct and can be used in written English.
For example, you could write, "The team developed a group of methods to measure the effects of the new protocol."
A group of methods that generate an image of a sample by using a beam of electrons.
The best choice of a group of methods, allowing a complete characterization of catalysts, is proposed.
One group of methods updates the measure, the other group changes the function.
A new group of methods called enhanced methods is introduced to improve the performance of the matrix methods.
Reconstruction of petroleum fractions comprises the group of methods that allow to create mixtures of molecules from partial analytical data.
The second group of methods presented in the paper refers to the general second-order methods of analysis.
This method is given in two forms: original Hardy Cross method-successive substitution methods and improved-simultaneous solution method (Newton Raphson group of methods).
This method belongs to the group of methods for solving boundary value problems such as the finite element method (FEM) or the boundary element method (BEM).
Direct-coupling analysis is a group of methods to harvest information about coevolving residues in a protein family by learning a generative model in an exponential family from data.
Since linguistic philosophy tends to be considered by its proponents to be a method or a group of methods, internal diversity within the area of concern is not surprising.
The second group of methods makes use of some mathematical concepts to estimate the local error at each computational grid point and the step-size is set so as to maintain it lower than a prescribed tolerance.
