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Variance (statistics)
Variance (statistics) A measure of the amount by which a value differs from the mean.
RELATED TERMS--------------------------------------
Mean
The sum of the values of all observations or data points divided by the number of observations, an arithmetical average.
SIMILAR TERMS--------------------------------------
Variant Angina
A type of angina that occurs at rest. Most often due to coronary spasm.
Varicella
Also known as chickenpox is a mild, highly contagious disease characterised by fever and itchy blisters all over the body. It is caused by the varicella zoster virus. It is very common in children but can affect people of all ages.
Varicella vaccine
The newest vaccine developed for children; the American Academy of Pediatrics recommends giving it between 12 and 14 months. Estimated to be 70 to 90 percent effective - if your child still comes down with chicken pox, it will be a mild case.
Varices
Stretched veins such as those that form in the esophagus from cirrhosis.
Varicocele
Dilated veins in the spermatic cord above or around the testis that can cause decreased sperm production on the affected side.
Varicose vein
An abnormally dilated vein.
Varicose Veins
Varicose veins -swollen, purple veins- are common in the legs and around the vaginal opening during late pregnancy. In most cases, varicose veins are caused by the increased pressure on the legs and the pelvic veins, and by the increased blood volume.
Varicose veins
Swollen, distended veins especially visible in the legs.
Variola
Syn: smallpox.
Variolation
The historical practice of inducing immunity against smallpox by "scratching" the skin with the purulency from smallpox skin pustules. The first inoculation for smallpox is said to have been done in China about 1022 B.C.
PREVIOUS AND NEXT TERMS--------------------------------------
Viremia
The presence of virus in the bloodstream.
Virion
The complete virus particle that is structurally intact and infectious.
Vermiculite
A lightweight and highly water-absorbent micaceous mineral that is sometimes used as a substitute for asbestos.
Validation of data
Procedure carried out to ensure that the data contained in the final clinical trial report match original observations.
Validity
The accuracy of the relationship between two or more variables.
Variance (statistics)
Veganism
The custom of refraining from using, or at least from ingesting, anything derived from animals.
Vital force (bioenergy, cosmic energy, cosmic energy force, cosmic force, cosmic life energy, cosmic
An alleged nonmaterial "force" that sustains life.
Vitrectomy
Removing the gel from the center of the eyeball because it has blood and scar tissue in it that blocks sight. An eye surgeon replaces the clouded gel with a clear fluid.
Vitreous Humor
The clear jelly (gel) that fills the center of the eye.
Void
To empty the bladder in order to obtain a urine sample for testing.
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