Lebron James is argued by some to be the greatest basketball player of all time.

Impacting a team's success is key to being among the greats. We each season's win percentage to quantify this.

We will explore how the Cleveland Cavaliers and Miami Heat were impacted by Lebron James joining their team.

This histogram is the distribution of win percentages for all NBA teams from 2000-2018.

This is the distribution of win percentages for the Cleveland Cavaliers from 2000-2018. Note how they range from around 0.2 to 0.75.

Now we will look at the Cavaliers win percentage for seasons without Lebron James.

This is the distribution of win percentages for the Cleveland Cavaliers from 2000-2018 taking out the seasons in which Lebron James was on the team.

There are no win percentages higher than 0.4.

Now we will look at the Cavaliers win percentage for seasons with Lebron James.

This is the distribution of win percentages for the Cleveland Cavaliers from 2003-2010 and 2014-2018 (the seasons in which Lebron James was on the team).

Not surprisingly, all of the win percentages are higher than 0.4 and reach 0.8.

Let's see if the "Lebron Effect" holds true for another team he played on: The Miami Heat.

This is the distribution of win percentages for the Miami Heat from 2000-2018. Note how they range from around 0.15 to 0.8

Now we will look at the Heat win percentage for seasons without Lebron James.

This is the distribution of win percentages for the Miami Heat from 2000-2018 taking out the seasons in which Lebron James was on the team.

The Miami Heat was better than the Cavaliers to begin with, but all of the majority of win percentages are less than 0.6.

Now we will look at the Heat win percentage for seasons with Lebron James.

This is the distribution of win percentages for the Miami Heat from 2010-2014 (the seasons in which Lebron James was on the team).

Holding true with the previous trend, the win percentages are all higher than 0.6.

It turns out that Lebron James's fame and recognition are not exaggerations and the "Lebron Effect" holds true.

Lebron James is such a great player that the teams he joins are visibly positively impacted as seen by the win percentages.

When Lebron James joins a team, that team will win more games.