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Use "nonstationary" in a sentence
"The r2 statistic is quite simply inappropriate because it fails to accurately evaluate low-frequency skill in settings where the mean is nonstationary, which is the case in long-term paleoclimatological studies."
"Clive Granger (who recently won a Nobel) and Christopher Sims were raising all sorts of alarms about the problem of what is called nonstationary data."
"Meanwhile, the storm is not going to remain in place, it's nonstationary."