The phrase "a slight decrease in the frequency" is correct and usable in written English.
It can be used when discussing changes or trends in data, statistics, or observations related to frequency.
Example: "The study revealed a slight decrease in the frequency of reported incidents over the past year."
Alternatives: "a minor reduction in the frequency" or "a small drop in the frequency."
Treatment of the cells with actinomycin D resulted in a slight decrease in the frequency of cells with a bright nuclear spot.
Although this result needs confirmation, it is in agreement with different reports where a slight decrease in the frequency of HLA-B*58 was observed [ 6, 8, 28].
Field-collected flies from this population in 2007 showed a slight increase in the frequency of XYM males and a slight decrease in the frequency of IIIM/III males (relative to 2002 and 2006), suggesting that the relative frequency of XYM and IIIM/III can vary slightly over time (Hamm and Scott 2008).
They also observed a slight decrease in the rotation frequency of the spiral wave with increased fibrosis.
In all frequency ranges, the scoria concrete shows a slight decrease in the absorption coefficient compared with the wood-made concrete.
In workers exposed to extremely low-frequency electromagnetic fields, Irgens and researchers (65) found a slight decrease in the sex ratio for offspring to workers in smelter industries in Norway (SR = 0.99) compared to unexposed workers (SR = 1.06).
It shows a slight increase in ethylene yield and a slight decrease in the butylene yield.
The effect of mtr1-deletion on microtubule stability is relatively minor, with slight increase in dwell-time and slight decrease in the frequency of catastrophe.
Although statistically significant, this slight decrease in the frequency of apoptotic cells within the tumours of animals treated with both DTIC and WEB2170 may not be the cause of the prolonged survival of this group of animals.
Interestingly, concern with student participation became a consistent subject during subsequent instructional team meetings because GTAs and instructors both observed a slight decrease in frequency of participation in the latter half of the term.
Deletion of PFK1 resulted in a slight decrease in oscillation frequency.
