DiffI | R Documentation |
Diffs within clusters based on a time vector with possibly unequal intervals
DiffI(xx, ...)
x |
vector to be lagged |
id |
clustering variable |
idx |
time variable |
lag |
(default 1) |
at |
alternative to 'lag': evaluate x at a particular value of 'idx' |
check |
(default TRUE) check for unique values of idx within each cluster |
return the value of x minus x in the position 'idx - lag' in the same cluster using intrapolation
LagI
, DiffI
, Diff
,
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