The phrase "a precursor model" is correct and usable in written English.
It can be used when referring to a model that serves as a forerunner or an early version of something that will follow or develop later.
Example: "The researchers developed a precursor model to test their hypotheses before creating the final version."
Alternatives: "an initial model" or "a preliminary model".
However, in a precursor model (Cruse 1983), it has been shown how this might be possible.
Throughout the model building process, an altered model was chosen over a precursor model if a difference in the objective functions (−2 log-likelihood) was >6.63 (P < 0.01, with 1 degree of freedom, assuming an X distribution).
Throughout the model building process, an altered model was chosen over a precursor model if the difference in the objective functions (−2 log likelihood) was >6.63 (P < 0.01, with 1 degree of freedom, assuming χ distribution).
Until now, the laboratory studies using a precursor model of PCDD/F formation were not able to mimic the test fields in the incinerators, where PCDFs are dominant product.
This suggested that visual memory fitted a more specific disease precursor model than verbal memory, a finding compatible with Skelley et al's study [5] showing that visual memory impairments were present in schizophrenic patients but absent in their non-affected adult relatives.
The second implies composition of the models and aims at reproducing experimental dynamics of all precursor models.
In addition, the composite model covers experimental data obtained from all precursor models, each of which separately satisfies its own data only.
Compared to the deterministic precursor model, where a preliminary fixed value for the potential spread between surveys was included, the pre-SPF of the stochastic model reflected disease dynamics more realistically.
The presented in here results indicate the ratio of chlorinated benzenes to chlorinated phenols in the reaction feed of precursor model as a key factor determining the PCDD to PCDF ratio.
The existence of the lariat precursor model in lower eukaryotes suggests a possible mechanism in which circular RNA arose as a byproduct of exon skipping and that, as intronic architecture changed, so did mechanisms for maintaining expression of these molecules.
Most importantly, this study shows that the precursor model is absolutely valid in cases where a large excess of PCDFs is formed over PCDDs.
