"more frequent appearance" is correct and usable in written English.
You can use it to talk about something that is appearing or happening more often than normal. For example, "With the recent rise in global temperatures, more frequent extreme weather events have begun to appear."
Dr. Wilson speculated that the more frequent appearance of the firing sequences in R.E.M. episodes before the rats ran the maze might mean that R.E.M. is "more precisely concerned with the remote past," involving a re-evaluation of past experience, rather than a simple translation of recent events.
As stated earlier, Owman-Moll et al. [3] reported more frequent appearance of anatomic repair (12%) in the teeth retained for 8 weeks.
The more frequent appearance of the faces of carers during infancy in the centre and upper visual fields may provide the driving force.
Increasing the dose of a drug leads to a more frequent appearance of side effects.
We found that pretreatment CTC counts ≥5/7.5 ml correlated with greater metastatic dissemination at the time of treatment failure, owing to more frequent appearance of new metastatic lesions and sites.
Primary outcome of the study was to test the hypothesis that patients with tumours or PSC have lower NPP7 activity and/or more frequent appearance of the 1.2 kb form than those with gallstones or other benign disease.
The trend appears to be more frequent appearances; it could be only a matter of time before we see more than one pop-up at once.
Now Momz-N-Da Hood are making more frequent appearances.
On the other hand, Mantan Moreland's more frequent appearances in a similar role in later Chan films are not.
Likewise, Mr. Levitus said, it is possible but not established that more frequent appearances of the phenomenon known as El Nino, a semi-periodic warming of the eastern tropical Pacific that disrupts weather around the world, are related to the generally warming ocean.
Although Mr. Mendes's production, played on a bare wooden set designed by Tom Piper, starkly lit by Paul Pyant, tends to de-emphasize the warmly regenerative powers of the characters' sojourn in the forest, sprigs of green begin to make more frequent appearances when the stage gradually fills with the rustics.
