The definitional equation of sample variance is , where the divisor is called the degrees of freedom (DF), the summation is called
ðə dˌɛfɪnˈɪʃənəl ᵻkwˈeɪʒən ʌv sˈæmpəl vˈɛɹiəns ɪz , wˌɛɹ ðə dᵻvˈaɪzɚɹ ɪz kˈɔːld ðə dᵻɡɹˈiːz ʌv fɹˈiːdəm dˌiːˈɛf, ðə sʌmˈeɪʃən ɪz kˈɔːld