The phrase "a lack of trial" is correct and usable in written English.
It can be used to describe a situation where there is an absence of testing or experimentation, often in a legal or scientific context.
Example: "The researchers concluded that a lack of trial data made it difficult to assess the effectiveness of the new drug."
Alternatives: "absence of testing" or "deficiency of trials".
Mr. Christie, a Republican activist who got his job despite a lack of trial and criminal-law experience, has gone up to the line of acceptable behavior — and possibly crossed it.
In primary prevention of cardiovascular disease in people at lower levels of absolute risk, there is currently a lack of trial evidence showing benefits from statin treatment in terms of total mortality.
31 This is intensely debated, partly due to a lack of trial evidence on the end-organ benefit and mostly due to a reluctance to introduce insulin early on in a chronic disease.
Meta-analysis was not possible due to the diversity in research methods, genetic testing and interventions used, and reliance on estimated health outcomes due to a lack of trial, cancer registry and observational data.
It would be entirely inappropriate to use the findings of this review to deny patients with cancer access to treatment for depression and depressive symptoms because of a lack of trial data on effectiveness.
Additionally, characterisation of inequity in randomised trial evidence (for example, whether inequity is largely explained by a lack of trial evidence for diseases predominantly affecting people in low income regions) may inform priority setting decisions on which research areas or diseases are most important to monitor.
We also identified a lack of trials of cluster randomisation.
On the whole, the guidelines were heterogeneous, seemingly due to a lack of trials assessing the role of ADs in treatment strategies.
These included a lack of trials reporting clinical symptoms and consequences of anaemia and highlighted ongoing uncertainty regarding optimal dosing and regimen for iron supplementation in pregnancy.
The robustness of this conclusion is limited by a lack of trials with a low risk of bias, sparse data, heterogeneity among trials, and a concern regarding small trial bias.
There is also a lack of trials comparing insulin with lifestyle changes as most of these trials are funded by the pharmaceutical industry which have a vested interest in promoting drug usage [ 23].
