Because of the study's retrospective nature, many other factors could not be validated.

The main problem was with the retrospective nature of these votes, he argued.

First, the retrospective nature of the data collection introduces inherent biases.

Limitations of this report include its retrospective nature that precludes a consistently organized analysis of the effects of hypnosis in this patient population.

Well, it was perhaps natural that with her retrospective nature she should imitate the, apparel of the past ages which seemed to claim all her thoughts.

However, the retrospective nature of this study is a major weakness.

A common feature of "fudge factors" in science is their arbitrariness, and their retrospective nature.

The retrospective nature of the reply speech means that no new material may be introduced in this speech.

Many specific considerations have not been taken into account, such as the absence of a transitional period and the retrospective nature of certain measures.

The retrospective nature of this study and the small numbers of patients in each treatment group should be viewed as major weaknesses.