The phrase "are completely due" is correct and usable in written English.
It can be used to indicate that something is entirely owed or required, often in the context of deadlines or obligations.
Example: "The reports are completely due by the end of the week, so please ensure they are submitted on time."
Alternatives: "are fully owed" or "are entirely required".
(2015) are completely due to the fact that we only have available data for a smaller set of participating countries.
In the partial and total DOS, the electronic states at E F are completely due to the d state electrons of transition metal atom, and above E F the electronic states are mainly originated due to the chalcogenide atom.
This does not necessarily mean that these differences are completely due to over-reporting and do not exist.
21 Hence, we performed a sensitivity analysis on the non-metastatic groups where differences in outcomes were seen, and showed that the effect of any unmeasured confounder would have to be large to infinite to account for our observed findings (table 5), making it highly unlikely that our results are completely due to residual confounding.
The epic victory is ascribed as being completely due to the strategic genius of Stalin.
The epic victory gained through the armed might of the land of the Soviets, through our heroic people, is ascribed in this type of novel, film and "scientific study" as being completely due to the strategic genius of Stalin.
A law cutting the state's gas tax to 25 cents a gallon, from 32 cents, took effect on July 1, but it was unclear whether the price drop was completely due to the tax cut.
According to the variance of imprint force and resultant angle, the force during the second period was completely due to adhesion.
Note that the leftmost peak of N = 3 in Figure 6 d) is completely due to the small denominator ( R = 1 − T ≈ 0 ) at that point.
"But it could be something that is completely due to chance". A very small number of people are involved, he said.
