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Chi-Square Distribution
Research News and Information
Definition of 'Chi-Square Distribution'A distribution in which a variable is distributed like the sum of the squares of any given independent random variable, each of which has a normal distribution with mean of zero and variance of one. The chi-square test is a statistical test based on comparison of a test statistic to a chi-square distribution. The oldest of these tests are used to detect whether two or more population distributions differ from one another. |
Saturday, November 21, 2009
Does the negative node count affect disease-free survival in early-stage oral cavity cancer?
30 Oct 2009 
PURPOSE: We performed a retrospective study to determine whether there is a relationship between disease-free survival and negative lymph node count in patients with resected early-stage oral cavity cancers. MATERIALS AND METHODS: Of the 526 ... Read more...
Changes in at-risk behavior for HIV infection among HIV-positive persons in Italy.
29 Sep 2009 Many HIV-positive persons reportedly continue to engage in at-risk behavior. We compared the sexual and drug-using practices of HIV-positive persons before and after the diagnosis of HIV infection to determine whether their behavior had changed. To ... Read more...
A survey of occupational exposure to blood and body fluids in physiotherapists in Western Australia.
29 Sep 2009 The aim of this pilot project was to investigate the occurrence of occupational exposure to blood and body fluids in registered physiotherapists in Western Australia. Surveys were sent to physiotherapists with questions regarding personal ... Read more...
Latest indexed articles for 'Chi-Square Distribution'
These are the very latest articles for this heading:
- Does the negative node count affect disease-free survival in early-stage oral cavity cancer? 30 Oct 2009
- Changes in at-risk behavior for HIV infection among HIV-positive persons in Italy. 29 Sep 2009
- A survey of occupational exposure to blood and body fluids in physiotherapists in Western Australia. 29 Sep 2009
- A phase II randomized controlled trial to evaluate the safety and efficacy of Praneem polyherbal vaginal tablets compared with betadine vaginal pessary in women with symptoms of abnormal vaginal discharge. 29 Sep 2009
- [Impact of the chemotherapy protocols for metastatic breast cancer on the treatment cost and the survival time of 371 patients treated in three hospitals of the Rhone-Alpes region] 29 Sep 2009
- Appropriateness of collaborations between industry and the medical profession: physicians' perceptions. 29 Sep 2009
- Interaction of left ventricular geometry and myocardial ischemia in the response of myocardial deformation to stress. 29 Sep 2009
- Relation of obesity to heart failure hospitalization and cardiovascular events in persons with stable coronary heart disease (from the Heart and Soul Study). 29 Sep 2009
- Comparison of distributions of key predictor variables in CIREN and NASS-CDS cases meeting CIREN inclusion criteria. 29 Sep 2009
- Belt use: comparison of NASS-CDS and police crash reports. 29 Sep 2009
- The Trail-making Test B and driver screening in the emergency department. 29 Sep 2009
- Distribution of human papillomavirus types in cervical cancers in Hong Kong: current situation and changes over the last decades. 29 Sep 2009
- Association analyses of the INSIG2 polymorphism in the obesity and cholesterol levels of Korean populations. 20 Sep 2009
- Clinical significance of frozen section analysis during resection of intraductal papillary mucinous neoplasm: should a positive pancreatic margin for adenoma or borderline lesion be resected additionally? 17 Sep 2009
- Influences of polymorphic variants of DRD2 and SLC6A3 genes, and their combinations on smoking in Polish population. 15 Sep 2009
- Comparative study of neurocognitive function in euthymic bipolar patients and stabilized schizophrenic patients. 13 Sep 2009
- Associations between betel nut (Areca catechu) and symptoms of schizophrenia among patients in Nepal: A longitudinal study. 9 Sep 2009
- Plasma levels of lipoprotein (a) in patients with major depressive disorders. 8 Sep 2009
- Anti-hepatitis B virus X protein in sera is one of the markers of development of liver cirrhosis and liver cancer mediated by HBV. 4 Sep 2009
- Neuroanatomical correlates of impaired decision-making and facial emotion recognition in early Parkinson's disease. 2 Sep 2009
See a longer list of these articles.
Technical information about 'Chi-Square Distribution'
Definition: A distribution in which a variable is distributed like the sum of the squares of any given independent random variable, each of which has a normal distribution with mean of zero and variance of one. The chi-square test is a statistical test based on comparison of a test statistic to a chi-square distribution. The oldest of these tests are used to detect whether two or more population distributions differ from one another.
Descriptor UI: D016009
Alternative terms: Chi-Square Distribution; Chi Square Distribution; Chi-Square Distributions; Distribution, Chi-Square; Distributions, Chi-Square; Chi-Square Test; Chi Square Test; Chi-Square Tests; Test, Chi-Square; Tests, Chi-Square;
Tree Number: E05.318.740.994.300; G17.820.300; N05.715.360.750.750.200; N06.850.520.830.994.300;
History Note: 90
Technical Notes: IM GEN only; coord NIM with specific disease or other concept (IM); no qualif; specify geog if pertinent