If the document opened in the IFRAME does not have any targets set, then all those links will open in the same iframe as the parent document. You can use this feature to make links in one IFRAME change the contents of another IFRAME on the same page. IFrames and Security. The IFRAME element, by
Sigma notation, often referred to as summation notation, can be used in many common situations. For example, it can be used to calculate the sum of deposits for a bank account. Banks add together all deposits and withdrawals to determine the current balance.
Sigma levels 1 through 6 designate the maximum number of defects per million in a process or system and relate to the overall percentage of accuracy according to the following specifications. 1  1 Sigma: 690K errors per million (31% accuracy). 2  2 Sigma: 308K errors per million (69% accuracy).