The phrase "are needed to generalize" is correct and usable in written English.
It can be used when discussing the requirements or conditions necessary for making generalizations in a particular context.
Example: "In order to draw broader conclusions from the data, certain parameters are needed to generalize the findings."
Alternatives: "are required to generalize" or "are essential for generalizing".
We conclude that although larger samples are needed to generalize results, the picture-sort dietary assessment method appears to be promising and merits further research.
However, more data are needed to generalize the observation.
More experiments are needed to generalize the results of the comparison of TLC and spherical silica gel-HPTLC plates to other drugs and pharmaceuticals.
Everything that has been said about observables, strictly speaking, applies only to the case in which the values of the observable form a discrete set; the mathematical niceties that are needed to generalize it to the case of continuous observables are complicated, and raise problems of a more technical nature.
Further investigations involving a large number of genes and variations in the THz radiation characteristics as well as longer time exposure are needed to generalize these striking correlations between promoter-specific breathing dynamics, probability for THz induced nonlinear resonances, transcriptional response, and cellular behavior.
More studies are needed to generalize these findings.
Further research, including the application of combined GIS techniques and modeling approaches, is needed to generalize our findings over other semiarid areas.
Further research is needed to generalize the findings to other vaccine regimens and biomarkers.
However, SEM using data indigenous to the USA is needed to generalize findings to the USA.
As such, future work is needed to generalize these findings beyond a geospatial context and to other visualization techniques.
A multicenter-study is needed to generalize our findings to all of Taiwan.
