For example,
| Airline | Origin | Destination |
| AA | ORD | LAX |
| UA | ORD | LAX |
| AA | IAD | LAX |
| UA | IAD | LAX |
So in the example data, AA and UA operate in the 2 markets.
Please help me to figure out the command for this work. Thank you for your time and attention.
Count observations
Hello, I am trying to count observations which have the same value for some variable but different ID.
For example,
I am trying to figure out the multimarket contact of two airlines(AA and UA). I want count the route where both AA and UA operate nonstop flight.
So in the example data, AA and UA operate in the 2 markets.
Please help me to figure out the command for this work. Thank you for your time and attention.
For example,
So in the example data, AA and UA operate in the 2 markets.
Please help me to figure out the command for this work. Thank you for your time and attention.
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