The phrase "a more valid estimation" is correct and usable in written English.
It can be used when discussing the accuracy or reliability of an estimation in comparison to another.
Example: "After reviewing the data, we believe that a more valid estimation of the project's costs is necessary."
Alternatives: "a more accurate assessment" or "a more reliable estimate."
We believe that the methods used in non-outbreak studies included in our review permit a more valid estimation of MRSA prevalence, than studies performed during outbreaks which usually focus on the efficacy of the measures taken.
On the other hand, an electronic questionnaire might result in a more valid estimation of dental fear than if it were asked, e.g. in connection with a clinical examination, in which those with high fear might not participate.
Also, in contrast to the previous study, where a mixture of matrices (umbilical cord, maternal serum, placenta) were used to estimate fetal DDE exposure (Gladen et al. 1988; Rogan et al. 1986b), we used maternal serum samples at each trimester of pregnancy, a more valid estimation of such exposure (Dorea et al. 2001).
We explored whether the combination of three routine data sources (hospital discharges, death registry, health survey) allows a more valid prevalence estimation.
If this approach succeeds in allocating patients completing the withdrawal treatment to appropriate subsequent treatment, a larger trial will be needed to derive a more valid and reliable estimation of the effects.
Open question formats represent a more valid testing situation.
A more valid concern, though, is law enforcement.
Excluding these patients will ensure a more valid prediction model.
The period lifetable appears to provide more valid estimates of length of wait and should therefore be substituted for census- and event-based methods of estimation, wherever possible.
When competing risks are absent (i.e., the competing event death has not occurred), the Kaplan-Meier estimator gives a valid estimation of the probability of revision surgery.
