The phrase "a lack of specified" is not correct in English.
It seems to be missing a noun after "specified." You can use it in contexts where you want to discuss the absence of something that should have been specified, but it needs to be rephrased for clarity.
Example: "The report showed a lack of specified guidelines for the project."
Alternatives: "a lack of clarity" or "an absence of specification."
As yet, there is a lack of studies that specify the short- and long-term prognosis for this group.
The investigators reported a lack of association without specifying the various thiazolidinediones used by the patients.
This included a lack of understanding of depression specified in general terms (e.g., "Some people do not understand what depression is").
For metoprolol, a lack of relevant interaction was specified a priori to correspond to the 90% confidence interval for the period 2-to-period 1 ratio for each exposure parameter (AUC0- t, AUC0 ∞, and Cmax) falling within the range of 80.00 to 125.00%.
MR-conditional indicates a lack of known hazards in a specified MRI environment with specified conditions of use.
However, a lack of sophisticated coordination mechanisms for specifying workflow deters the widespread adoption of Grid Services.
The major problem in applying SVR and ANN is a lack of a specific method to specify some parameters such as ε and ϒ in SVR and the number of hidden layers in ANN.
The horns of domesticated livestock can therefore be lost not because humans select directly for their reduction but because a lack of sexual selection allows alleles specifying smaller horns to increase in frequency indirectly or by chance (Mignon-Grasteau et al. 2005; Zeder et al. 2006a).
Financial problems were identified as contributing to these logistical difficulties, with half the participants specifying a lack of money for transportation as a factor in their clients' decisions not to attend PNC.
It is important to emphasize that the proposed model specifies a lack of space time interaction on the log scale, so that the percent change over time, not the raw concentration, is constant across locations.
