General Statistics
Symbol Description Table (P - Q)
Index: A - D
 E - L 
 M - O
 P - Q 
 R 
 S 
T -W 
X -Z 
Symbol Description Symbol Description
P (1) Proportion of sample observations having a particular characteristic

(2) Proportion of successes from a Bernoulli process - binomial

 Pr[A] Probability of event A
Pr[A/B] Conditional Probability of event A given event B Pr[A and B] Probability of the interaction of events A and B; occurs only when both A and B occurs (also called joint probability of A and B)
Pr[A or B] Probability of the union of A and B; occurs when either A or B or Both occur Pr[X=x] Probability that the random variable X assumes one of several particular values.
Pr[} Cumulative probability that X assumes any value less than or equal to a particular value x p* Critical value of P; used in one-sided hypothesis testing procedure
p-value The probability of a type I error PA , PB Proportions of observations having a particular characteristic for samples from populations A and B
Pc Combined sample proportion; used in two-sample inferences for comparing proportions of two populations Number of permutations of r items taken from a collection of size n when different orders of selection are counted
  Mean of populations; used in analysis of variance Mean of treatment combination populations; used in analysis of variance
pn , po Prices per unit of an item in year n and in base period 0; used in constructing index numbers. (pi) (1) Proportion of a population having a particular characteristics

(2) Probability of a trial success in a Bernoulli process - binomial
Value of the population proportion assumed under the null hypothesis Values of population proportions in testing for equality of several population proportions
Proportions of populations A and B that are compared in two-sample hypothesis tests Indifference probability established for winning reference lottery or achieving outcome Ok for certain
Quantities of an item in year n and in base period 0; used in constructing index numbers