Three kinds of information are needed to calculate a Pearl Index for a particular study:

There are two calculation methods for determining the Pearl Index:

The Pearl Index is sometimes used as a statistical estimation of the number of unintended pregnancies in 100 woman-years of exposure ( e. g. 100 women over one year of use, or 10 women over 10 years ).

* Actual use Pearl Index, which includes all pregnancies in a study and all months ( or cycles ) of exposure.

* Perfect use or Method Pearl Index, which includes only pregnancies that resulted from correct and consistent use of the method, and only includes months or cycles in which the method was correctly and consistently used.

Like all measures of birth control effectiveness, the Pearl Index is a calculation based on the observations of a given sample population.

The Pearl Index has unique shortcomings, however.

So the longer the study length, the lower the Pearl Index will be-and comparisons of Pearl Indexes from studies of different lengths cannot be accurate.

The Pearl Index also provides no information on factors other than accidental pregnancy which may influence effectiveness calculations, such as:

A common misperception is that the highest possible Pearl Index is 100-i. e.

However, if all the women in the study conceived in the first month, the study would yield a Pearl Index of 1200 or 1300.

The Pearl Index is only accurate as a statistical estimation of per-year risk of pregnancy if the pregnancy rate in the study was very low.

In 1966, two birth control statisticians advocated abandonment of the Pearl Index:

: Pearl Index does not serve as an estimator of any quantity of interest, and comparisons between groups may be impossible to interpret ...

* Pearl Index, a birth control research technique

# REDIRECT Pearl Index

They knew that I was still grieving over the tragic event, and they felt that if I could see the recovery and the spirit of the people, who hold no grudge, but who also regret Pearl Harbor, I would be happier and would understand better a new Japan.

" Pearl milk tea " is also used by English speakers and overseas Chinese and Taiwanese speakers, but it is usually called bubble tea.

: Year One: Old Testament ( also includes some coverage of related topics in the Book of Moses and Book of Abraham from the Pearl of Great Price )

Commuter rail systems are also planned for Shanghai, Nanjing, Tianjin and around the Pearl River Delta region.

English had, however, been used as a literary language for centuries before Chaucer's life, and several of Chaucer's contemporaries — John Gower, William Langland, and the Pearl Poet — also wrote major literary works in English.

In Fermi's 1954 address to the American Physical Society ( APS ) he also said, " Well, this brings us to Pearl Harbor.

Notable performers there included among others: Pearl Bailey, Count Basie, Nat King Cole, John Coltrane, Miles Davis, Ella Fitzgerald, Coleman Hawkins, Billie Holiday, Lena Horne, Burl Ives, Leadbelly, Anita O ' Day, Charlie Parker, Les Paul and Mary Ford, Paul Robeson, Kay Starr, Art Tatum, Sarah Vaughan, Dinah Washington, Josh White, Teddy Wilson, Lester Young, and The Weavers, who also in Christmas 1949, played at the Village Vanguard.

They were also an important influence on the development of alternative rock, as bands adapted elements from the " Zeppelin sound " of the mid-1970s, including The Smashing Pumpkins, Nirvana, Pearl Jam and Soundgarden.

Unlike other Latter Day Saint movement traditions ( such as the Community of Christ ), it also accepts the Pearl of Great Price as part of its scriptural canon, and has a history of teaching eternal marriage, eternal progression, and plural marriage ( although the LDS Church had abandoned that practice by the early 20th century ).

The Mormon scriptural canon also includes a collection of revelations and writings contained in the Doctrine and Covenants and the Pearl of Great Price.

The Parable of the Pearl ( also called the Pearl of Great Price ) is a parable of Jesus of Nazareth.

The phrase " Pearl of Great Price " has also been interpreted more widely to apply to things of great value in a number of religious contexts.

The Pearl or Mukta in Sanskrit is also associated with many Hindu deities.

It is also sometimes used to compare birth control methods, a lower Pearl index representing a lower chance of getting unintentionally pregnant.

There were also autographs by band members from Depeche Mode, Tool, the Fray, Judas Priest, Pearl Jam and more, as well as signatures from Ricky, Julian and Bubbles from " Trailer Park Boys: The Movie " on a rare Epiphone guitar.

The band also opened for Pearl Jam on their 2011 South and Central American tour in November and their European tour in June and July 2012.

There is also a SEAL Delivery Vehicle ( SDV ) unit, SDVT-1, located in Pearl Harbor, Hawaii.

Fitzgerald also made a one-off appearance alongside Sarah Vaughan and Pearl Bailey on a 1979 television special honoring Bailey.

Soundgarden's album Badmotorfinger and Alice in Chains ' Dirt, along with the Temple of the Dog album collaboration featuring members of Pearl Jam and Soundgarden, were also among the 100 top selling albums of 1992.

" Pearl Jam also felt the burden of success, with much of the attention falling on frontman Eddie Vedder.

Pearl Jam also continued to perform well commercially with its second album, Vs. ( 1993 ).

A little farther along the road you come to the Church of Santa Sabina, called the `` Pearl of the Aventine ''.

As a reward for Guanyin saving his son, the Dragon King sent his granddaughter, a girl called Longnü (" dragon girl "), to present Guanyin with the Pearl of Light.

Smith's 1838 written account of this vision is considered by some Mormon denominations to be scripture and is contained in a book called " The Pearl of Great Price.

Sri Lanka has been called The Pearl of the Indian Ocean.

During his time in Hawaii, Patton was part of the military units responsible for the defense of the islands, and specifically wrote a defense plan, called " Surprise ", anticipating an air raid against Pearl Harbor – 10 years before the attack by the Imperial Japanese Navy on December 7, 1941.

Starting in 1942, there was forcible relocation and internment of approximately 110, 000 Japanese Americans and Japanese residing in the United States to housing facilities called " War Relocation Camps ", in the wake of Imperial Japan's attack on Pearl Harbor.

Japanese-American internment was the relocation and internment by the United States government in 1942 of about 110, 000 Japanese Americans and Japanese who lived along the Pacific coast of the United States to camps called " War Relocation Camps ," in the wake of Imperial Japan's attack on Pearl Harbor.

* In Pokémon Diamond and Pearl, there is an obtainable item called the ' Adamant Orb ' which raises the dragon and steel type attacks of Dialga.

Van has often been called " The Pearl of the East " because of the beauty of its surrounding landscape.

In Survivor: Pearl Islands it was also called " seamail ".

In-show, the Cursed Pearl is called the " Black Pearl " ( though in the first season, its actual color is really silver ).

The Princes ' House is affectionately called the " Pearl of the Rococo Period ".

National Geographic Channel produced a documentary called Beyond the Movie: Pearl Harbor which covers some of the ways that " the film's final cut didn't reflect all the attacks ' facts, or represent them all accurately.

The legislation, called the Daniel Pearl Freedom of the Press Act, requires the United States Department of State to expand its scrutiny of news media restrictions and intimidation as part of its annual review of human rights in each country.

One historian has called it the " Pearl Harbor " of that war.

Smokey Point got its name from a 1950s outdoor-barbecue restaurant started by Eric and Pearl Shurstad, who called their place the Smokey Point Café after the plume of smoke it generated.

Just weeks after the Japanese air Attack on Pearl Harbor ( Sunday morning, December 7, 1941 ), the first news reports released to the public pertaining to Claire Chennault's war exploits occurred on December 20, 1941 when senior Chinese officials in Chungking that Saturday evening released his name to United Press International reporters to commemorate the first aerial attack made by the international air force called the American Volunteer Group ( AVG ).

Though the real name of the author, called " The Pearl Poet ", is unknown, some inferences about him / her can be drawn from an informed reading of his / her works.

These bands would form a new movement called Grunge and by far the most popular bands were Nirvana and Pearl Jam.