Take a difference between the value and the lagged value dealing with NaN
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Suppose I have a table T such as
Running Dist Swimming Dist
---------------------------------------------
Jan 18 100 10
Feb 18 80 NaN
Mar 18 105 12
I want to take n-month changes of Running distance and Swimming distance. (But skips when there are NaN.)
In case of n=1, it will be
Running Dist Swimming Dist
---------------------------------------------
Feb 18 -20 NaN
Mar 18 +25 NaN
Please advise.
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답변 (1개)
Sindhu Yerragunta
2018년 6월 18일
Hi Alpedhuez,
One suggestion would be cleaning your data before you calculate the difference. The following link elaborates on how to clean and standardize the missing data.
Hope this information helps.
-Sindhu
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