The phrase "a basic assumption underlying" is correct and usable in written English.
It can be used when discussing foundational beliefs or principles that support a particular argument, theory, or idea.
Example: "A basic assumption underlying this theory is that all individuals act in their own self-interest."
Alternatives: "a fundamental premise behind" or "a core belief supporting".
However, a basic assumption underlying the application of parametric IRT models is that the model is appropriate for the data, which in turn demands the choice of the right model and an evaluation of model fit.
However, a basic assumption underlying any filtering technique is that the signals being processed are approximately stationary, which may not be the case for speech or non-stationary noises.
In contrast to design-based inference (including model-assisted estimators), a basic assumption underlying model-based inference is that the values that are linked to the elements in the population are realizations of random variables.
A basic assumption underlying the EpiBasket project is that most of the essential questions that are needed today were posed in the past, and that those providing the results published in the best scientific journals should certainly be considered as the best possible candidate questions.
The basic assumption underlying SSA is that one can approximate a time series (mathbb {M}_{i}) of length K from L lagged samples, by considering the spectral analysis of specialized matrices, called trajectory matrices.
The basic assumption underlying the diagnostic instrument is that activities on a higher level are more predictable and better able to achieve a desired safety outcome, due to more insight in underlying mechanisms and more accurate information.
The basic assumption underlying the use of resource productivity as an indicator is that, under business-as-usual circumstances, resource use scales proportionally with economic growth, and that deviations from this proportionality are to be commended or discouraged on environmental grounds.
The basic assumption underlying the approach is that if foreclosure coincides with a change in management, it will lead to changes in vegetation structure and thus, NDVI values.
Recently, however, the basic assumption underlying this belief has been called into question, as market confidence in a wide array of assets offered in U.S. financial markets abruptly collapsed.
The basic assumption underlying configuration theory is that among the almost unlimited number of permutations of organizational and situational variables, only a few will be useful for understanding organizations and predicting their behavior (Miller 1981 , 1986.
