11. This PFD is derived from failure rate ( a frequency of occurrence ) and mission time for non-repairable systems. 12. The measure of large or small is based upon the frequency of occurrence ( measure in standard deviations ). 13. Therefore, those vowels have low functional load in New Zealand English despite their high frequency of occurrences in that dialect. 14. Instead of ten groups for each letter, word, or phrase, each could receive homophones based on its frequency of occurrence . 15. The aim of distribution fitting is to frequency of occurrence of the magnitude of the phenomenon in a certain interval. 16. The position and size of the compartments for lowercase letters vary according to the frequency of occurrence of the letters. 17. Where \ scriptstyle C _ i are the cumulative frequencies and \ scriptstyle f _ k are the frequencies of occurrences . 18. Cumulative frequency analysis is the analysis of the frequency of occurrence of values of a phenomenon less than a reference value. 19. A, T, G, and C represent the frequency of occurrence of the equivalent base in a particular sequence in a defined length. 20. Many studies have found that the frequency of occurrence of certain congenital malformations depends on the sex of the child ( table ).