News tagged with statistical model
A statistical model is a set of mathematical equations which describe the behavior of an object of study in terms of random variables and their associated probability distributions. If the model has only one equation it is called a single-equation model, whereas if it has more than one equation, it is known as a multiple-equation model.
In mathematical terms, a statistical model is frequently thought of as a pair (Y,P) where Y is the set of possible observations and P the set of possible probability distributions on Y. It is assumed that there is a distinct element of P which generates the observed data. Statistical inference enables us to make statements about which element(s) of this set are likely to be the true one.
Three notions are sufficient to describe all statistical models.
One of the most basic models is the simple linear regression model which assumes a relationship between two random variables Y and X. For instance, one may want to linearly explain child mortality in a given country by its GDP. This is a statistical model because the relationship need not to be perfect and the model includes a disturbance term which accounts for other effects on child mortality other than GDP.
As a second example, Bayes theorem in its raw form may be intractable, but assuming a general model H allows it to become
which may be easier. Models can also be compared using measures such as Bayes factors or mean square error.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
Johns Hopkins researchers say they have discovered specific chemical alterations in two genes that, when present during pregnancy, reliably predict whether a woman will develop postpartum depression.
Psychology & Psychiatry May 21, 2013 | not rated yet | 0 |
As scientists probe and parse the genetic bases of what makes a human a human (or one human different from another), and vigorously push for greater use of whole genome sequencing, they find themselves increasingly ...
Genetics Apr 26, 2013 | not rated yet | 0 |
Family caregivers of older adults with dementia are less stressed and their moods are improved on days when dementia patients receive adult day services (ADS), according to Penn State researchers.
Health 9 hours ago | not rated yet | 0
(Medical Xpress)—University of Nottingham researchers have developed a new predictive tool to help GPs identify and treat patients at risk of stroke.
Cardiology May 16, 2013 | not rated yet | 0
Individuals who have experienced a major bleed from their stomach or oesophagus (known as an upper gastrointestinal bleed) may be more likely to die from other causes, particularly malignant tumours and cardiovascular disease, ...
Diseases, Conditions, Syndromes Apr 30, 2013 | not rated yet | 0
A prospective study by researchers at Brigham and Women's Hospital (BWH) observed an association between risk of second primary cancer and history of non-melanoma skin cancer in white men and women.
Cancer Apr 23, 2013 | not rated yet | 0
A metabolic profile of intensive care unit (ICU) patients based on biomarkers of four metabolites can be used to accurately predict mortality, according to a new study.
Diseases, Conditions, Syndromes May 20, 2013 | not rated yet | 0
A new "alternative model" included in the upcoming Fifth Edition of the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM -5) lines up well with the current approach to diagnosis ...
Psychology & Psychiatry May 10, 2013 | not rated yet | 1