# Statistics Symbols - P

### Symbol: Pn,r (or n-p-r)

Meaning:
This refers to permutation. Permutation is defined as the number of ways the n distinct objects or items taken r at a time are arranged in order.
Formula used:

### Symbol: nPr (or n-p-r)

Meaning:
This refers to permutation. Permutation is defined as the number of ways the n distinct objects or items taken r at a time are arranged in order.
Formula used:

### Symbol: p^ ( Or p-hat)

Meaning:
It refers to the sample proportion.
Formula used:

### Symbol: P(A|B) ( Or, Probability of A given B)

Meaning:
This refers to the conditional probability.
Formula used:

### Symbol: P(A∩B) (OR Probability of A intersection B)

Meaning:
It implies probability of A and B.
Formula used:
P (A∩B) = Probability of both the events A and the event B.

### Symbol: P(AUB) (OR Probability of A union B)

Meaning:
It implies probability of A or B.
Formula used:
P (AUB) = Probability of either the event A or the event B.

### Symbol: P(X)

Meaning:
It refers to the Probability of X.
Formula used:

### Symbol: Poisson(λ)

Meaning:
It denotes Poisson distribution, λ denotes its parameter. It is a discrete probability distribution
Formula used:
X follows Poisson distribution, i.e., X~ Poisson (λ)
The pdf of X is given by,
P(X=x) = λxe-λ / x! ,x=0,1,…∞
Used in:
Poisson distribution.

### Symbol: p-value

Meaning:
It refers to the level of significance of a hypothesis test that is represented by the probability that the event would occur.
Formula used:
P value is the probability of rejecting the null hypothesis when the hypothesis is true for a given study.

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