Hello, Suppose I have this dataset: Name Value A -- A 22 A -- A -- A 35 A -- A -- B -- B 3 B 7 B -- B -- B 90 B -- What I want to accomplish is that for every "Name" I want to subset the observations between first time the value was observed and last time the value was observed. Desired dataset: Name Value A 22 A -- A -- A 35 B 3 B 7 B -- B -- B 90 Please help. Thanks.
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