"undermined the validity" is correct and usable in written English.
You can use it when you want to describe how something weakened or reduced the worth of something else. For example: "The poor quality of the data undermined the validity of the study."
It was therefore impossible to define a control population with which to determine the OD distribution in seronegative subjects: inclusion of seropositive subjects among the controls would have undermined the validity of this distribution and the determination of a valid cutoff.
But he added that leaving out the terminus undermined the validity of any ferry study.
Secular explanations of the world (modern physics, astronomy, evolution) have not made the world less wondrous, and have not undermined the validity or the authority of our wonderment.
Republicans strongly disputed that contention and said the procedure in no way undermined the validity of the absentee voting process since it involved only applications, not the ballots themselves.
In 1997, according to the Pew Research Centre, a typical poll conducted over five days would get responses from 36% of households; in 2003 the rate was 27%.The decline has not yet undermined the validity of polls as the accuracy of the final surveys suggests.
A run-in feature has allowed our trials to be more realistic; it has strengthened their ability to estimate the true treatment effect; and it has never undermined the validity of a trial's findings.
It undermines the validity of the ministry of every ordained woman and sends out a negative message to all women everywhere".
Heer said that if the hearing proceeded, there would be evidence that he contended would undermine the validity of a pact said to have been signed on Nov. 2, 2000, by Ted, John Henry and Claudia Williams proclaiming their desire to have their bodies frozen.
These new studies do not undermine the validity of the magisterial past research on hot hands, but expand and augment it, Dr. Yaari and the other authors say, adding even more human complexity.
On specific allegations of malpractice by Jones in the handling of weather station data from China, the panel did not comment directly, but concluded more generally: "Crucially, we find nothing in the behaviour on the part of CRU scientists that is the subject of allegations... to undermine the validity of their work".
It's the first time my mother has ever asked me that question, and I know that she is lovingly unaware of its ramifications as a nocuous cliche, despite its power as a racist stereotype – that of an overly assertive, hands on hips, neck swiveling, emasculating black woman, and which immediately undermines the validity of any strong views she might express.
