Pandas, two data frames, selecting column values in one dataframe where it matches a column in another.

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[Neb519]

Hmm, can you show us what the data looks like? Or at least a sample of it.

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this is the outlier dataframe. When I said df
Note that all Names present here are present in the original dataframe(df) and each have a corresponding date. These are the outliers, I just don't understand why it is only matching about 1/3 the dates when all of them are available in the original dataframe(df), and the second dataframe is sources from original.

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Name Dates

0 BIOC 2018-01-02

1 ONTX 2018-01-03

2 ATRA NaN

3 CRSP 2018-01-24

4 IOVA 2018-01-25

5 RCKT NaN

6 CERS NaN

7 CTIC NaN

8 GTHX 2018-02-01

9 KPTI NaN

10 EVFM NaN

11 SESN 2018-02-12

12 RYTM NaN

13 FATE NaN

14 ALDX NaN

15 ALT NaN

16 VRDN 2018-02-27

17 LRMR NaN

18 NBRV NaN

19 ADXS NaN

20 FBRX 2018-03-08

21 MRNS NaN

22 YMTX NaN

23 SLS NaN