Question

When does correlation not imply causation?

Answer 1

Coorelation describes the relation between two variable while we surely does not know whether one of the variable cause other variable of not. Thus, we cannot for sure that correlation does not imply causation.

Example: From observing the data of a cancer hospital, consumption of iodine by a skin cancer patient reduces their body cells effectiveness to recover which shows correlation between these two while we ignored other variables which cause and prevents patient from recovering which could be more problematic than consuming iodine. Thus there is direct correlation of consuming iodine with cancer as per the data but no causation.