the population of reported politician deaths rising
the mean age of politicians rising
the number of assassinated politicians rising
Or a combination of them all. Truth is arrived by falsifying all alternatives until you're left with only one explanation that fits. It's not enough for an explanation to match the data. That is called a hypothesis.
It could be a trend of:
the population of actual politicians rising
the population of tracked politicians rising
the population of reported politician deaths rising
the mean age of politicians rising
the number of assassinated politicians rising
Or a combination of them all. Truth is arrived by falsifying all alternatives until you're left with only one explanation that fits. It's not enough for an explanation to match the data. That is called a hypothesis.