Nhazi
Ihe n'ime ihenhọrọ mọọbụ ọnụọgụgụ nke data set.
Nhọrọ ndị ahụ ga-akpụzi mgbe ị na-etipụta.
N'ihe banyere calculator a
Variance is the average of the squared deviations from the mean and is the square of the standard deviation. This calculator gives the sample variance (sum of squared deviations divided by n − 1) or the population variance (divided by n), along with the standard deviation, mean, range and sum of squared deviations. Variance is expressed in squared units, which is why the standard deviation — its square root — is usually easier to interpret.
To find it, take the mean, subtract it from every value, square each of those deviations, add them together and divide by n − 1 for a sample or by n for a whole population. Squaring is what makes variance always non-negative and gives extra weight to values that lie far from the mean.
Worked example: for 12, 15, 17, 20, 22, 25 the mean is 18.5. The squared deviations sum to about 118.5, so the sample variance is 118.5 ÷ 5 = 23.7 and the population variance is 118.5 ÷ 6 = 19.75. Variance is the workhorse behind ANOVA, portfolio risk, quality control and many other techniques; the deviation table below lists each value’s distance from the mean and its square.
Ajụjụ ndị a na-ajụkarị
Olee otú varians na-emetụtara ụkpụrụ omume?
The standard deviation is the square root of the variance. Variance is in squared units (for example, squared dollars), while the standard deviation is back in the original units, so the two always describe the same spread.
Olee mgbe m ga-eji n versus n − 1?
Wepụ site n - 1 mgbe gị data bụ a sample ejiri mee nnyocha n'ime nnukwu ndịda; wepụ site n mgbe gị data na-egosi ndịda niile ị na-elekọta.
Gịnị mere varians ji dị na square units?
N'ihi na deviation ọbụla bụ squared tupu averageing, ihe pụtakwara na square nke mbụ unit - squared dollar, squared centimeters na ndị ọzọ. Na-eme ka varians na-atọ ụtọ iji kọwaa n'ụzọ ziri ezi, nke bụ ihe mere square root ya, standard deviation, bụ a kọwaara n'akụkụ ya.
Nwere ike iwepụ ngbanwe?
Ọ dịghị. Ọ bụ ọnụọgụgụ nke ọnụọgụgụ squared, ya mere ọ bụ seọlụ ma ọ bụ na-atọ. Oge ọ bụla nke seọlụ n'ozuzu ya pụtara na valiu niile na setịpụ bụ otu.
Gịnị bụ ọdịiche dị n'etiti varians na standard deviation?
Ha na-edepụta n'otu n'otu n'ihi na n'ụdị dị iche iche: varians bụ n'ozuzu ya squared deviation, na standard deviation bụ square root ya, n'ihu n'ọnụọgụgụ mbụ. Ọ bụrụ na varians bụ 25, standard deviation bụ 5.
Olee otú varians ejiri na nnyocha n'eziokwu?
N'ihe banyere nlekọta ahụike, a na-enyocha ihe ndị dị n'ime ụlọ ọrụ ahụ, dịka ọmụmaatụ, nlekọta ahụike na-enyocha ihe ndị dị n'ime ụlọ ọrụ ahụ, na-enyocha ihe ndị dị n'ime ụlọ ọrụ ahụ, na-enyocha ihe ndị dị n'ime ụlọ ọrụ ahụ, na-enyocha ihe ndị dị n'ime ụlọ ọrụ ahụ, na-enyocha ihe ndị dị n'ime ụlọ ọrụ ahụ, na-enyocha ihe ndị dị n'ime ụlọ ọrụ ahụ, na-enyocha ihe ndị dị n'ime ụlọ ọrụ ahụ.
API — jiri kaadị a site na kóòdù
Kpọọ kalkulata a dịka ebe ngwụcha JSON n'efu - enweghị kii achọrọ. Ziga valiu ebe ahụ n'okpuru dịka paramita ajụjụ mọọbụ JSON. Ihe ọbụla ị na-ewepụ na-eji dìfọ́ọ̀ltụ̀ nke a na-edebe ihuakwụkwọ a na ya; parameter a na-amaghị bụ 400, ọ dịghị sẽọ̀rọ̀. Gụọ ngwe ndị ahụ niile →
Ebemkpofuozi
GET https://calculator.free/api/v1/variance/curl
curl "https://calculator.free/api/v1/variance/?numbers=12, 15, 17, 20, 22, 25&type=sample"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/variance/?" + new URLSearchParams({
"numbers": "12, 15, 17, 20, 22, 25",
"type": "sample"
}));
const data = await r.json();
console.log(data.results);Ihe a na-ahụta bụ n'ihi nlekọta n'ozuzu ya, ọ bụghị nlekọta ego, ọgwụ ma ọ bụ nlekọta ego.