Sentence examples for cannot be properly controlled from inspiring English sources
However, there are many experimental variables that cannot be properly controlled and may lead to confounding results.
However, the cooling effect cannot be properly controlled such that the boiling point of the liquid fuel is maintained at suitable value irrespective of the volume flow rate of the combustion air, which is linearly varied with the firing rate of the burner.
We limited our analysis to never-smoking women, as the effects of former or current active smoking cannot be properly controlled with statistical adjustment.
Since this bias cannot be properly controlled for with the presently available data, there is no basis to conclude that there is any association between evolutionary rate and the number of interactions.
Despite the increasing number of experimental field studies of fitness for focal traits, in many cases these experiments are not possible, for example, when the environmental variables cannot be properly controlled.
Thus, for most studies, we cannot exclude the possibility that long-term carry-over effects including epigenetic inheritance can influence estimates of trait value divergence obtained, although the assay conditions were properly controlled.
This study also indicates that the contributions of direct environmental exposures, such as those we studied in Midland and Saginaw counties, cannot be properly assessed without careful control for the major explanatory variables such as age, sex, BMI, smoking, and breast-feeding.
In these conditions, state observation (and control) cannot be properly performed without accounting for the nonlinear nature of the motor magnetic circuit.
