# 1-bimoncdf vs binomcdf

#### hergreenatrocity

##### New Member
Hey, everyone. I'm new here, and I was just wondering what the difference is between 1-Binomcdf and Binomcdf?

#### BGM

##### TS Contributor
In general the CDF of a random variable $$X$$, $$F_X(x) = \Pr\{X \leq x\}$$

and the survival function $$1 - F_X(x) = 1 - \Pr\{X \leq x\} = \Pr\{X > x\}$$

Obviously they are different and I wonder why you ask this.

#### hlsmith

##### Omega Contributor
Is this just the cumulative probability of an event and the latter the cumulative probability of the event not happening?