Determining the Gap Distribution After Allocation of the Pools (Long-Term Statistics)
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There are different calculations for the long-term statistics depending on whether you have specified shift or drift (variation expansion) factors for the elements and which gap specifications are given. See the notation used in the equations below:

1.

Mean shift factor only

mGap,LT

s2Gap,LT

One or no gap specification

 

Both gap specifications

 

 

Note:   k i = 1 + 8/15 |Si|

2.

Variation expansion factor only

mGap,LT

s2Gap,LT

One or no gap specification

 

Both gap specifications

 

 

Note:   k i = Di

3.

Both mean shift factor and variation expansion factor

mGap,LT

s2Gap,LT

One or no gap specification

 

 

Note:   k i = max {Di, 1 + 8/15 |Si|}

Both gap specifications

 

 

Note:   k i = max {Di, 1 + 8/15 |Si|}

4.

Neither mean shift factor nor variation expansion factor

mGap,LT

s2Gap,LT

One or no gap specification

 

Both gap specifications

 

 

Note:   k i = 1.8

For calculations for short-term statistics, see Determining the gap distribution after allocation of the pools (short-term statistics).