pooled estimate of variance
where {xi}, {yj} are the two sets of sample observations with sample sizes nX, nY respectively and sample means 
.
- Gram–Schmidt method
- graph
- graph
- graph
- graphical solution
- graph metric
- graph paper
- graph theory
- Grassmannian
- gravitational constant
- gravitational force
- gravitational mass
- gravitational potential
- gravitational potential energy
- gravity
- great circle
- greatest common divisor
- greatest integer function
- greatest lower bound
- greatest value
- greedy algorithm
- Green, George
- Green's function
- Green's theorem
- Green-Tao theorem