This is the effect of the last, and unique, 5 coins that Coinbase has added to its platform in the last 30 months.

We hope that Stellar is the next big Coin that Coinbase will add for its users, and we hope it will have even more growth than the others!
What is this?
I guess that you compared the price of each coin at two different timepoints.
One for the launch day on Coinbase.
Another one for the next one week after the launch day.
Did I understand your statistical analysis method right?
Exactly, it is the gain of that coin since the coinbase made the official announcement, after 1 day and then after 1 week.
Meanwhile, we still have another with a large British company, Omnitube, who chose to leave the blockchain of ethereum to move to that of Stellar lumens.
In addition, Omnitude is working to create a hybrid solution to integrate Hyperledger's blockchain with Stellar to benefit from the scalability, speed and low commissions of the XLM blockchain.
https://cryptonomist.ch/en/2018/10/23/omnitude-migration-stellar/