Observational study, Advanced Statistics

Observational study is the study in which the objective is to discover cause-and-effect relationships but in which it is not feasible to use the controlled experimentation, in the sense of being able to impose process or treatments whose effects it is desired to discover, or to allocate the subjects at random to different measures. Surveys and most epidemiological studies come into this class. As the investigator does not control assignment of treatments there is no means to ensure that similar subjects receive different treatments. The classical instance of such a study that the successfully uncovered evidence of the important causal relationship is the smoking and lung cancer investigation of Doll and Hill. 

Posted Date: 7/30/2012 7:30:11 AM | Location : United States







Related Discussions:- Observational study, Assignment Help, Ask Question on Observational study, Get Answer, Expert's Help, Observational study Discussions

Write discussion on Observational study
Your posts are moderated
Related Questions
Intervention analysis in time series : The extension of the autoregressive integrated moving average models applied to time series permitting for the study of the magnitude and str

a company suppliers specialized, high tensile Pins to customers. It uses an automatic lathe to produce the pins. Due to the factors such as vibration, temperature and wear and tear

Minimum volume ellipsoid is a term for ellipsoid of the minimum volume which covers some specified proportion of the set of multivariate data. It is commonly used to construct rob

Codominance : The relationship between genotype at the locus and a phenotype to which it in?uences. If an individuals with heterozygote (such as, AB) genotype is phenotypically dif

1.Sam Lucarelli, owner of Lucarelli Products, is evaluating whether to produce a new product line. After thinking through the production process and the costs of raw materials and

Please help with following problem: : Let’s consider the logistic regression model, which we will refer to as Model 1, given by log(pi / [1-pi]) = 0.25 + 0.32*X1 + 0.70*X2 + 0.

Activity Description Create an MS Word document by cutting and pasting SPSS output into the document. Complete the following: Use an existing dataset to compute a factorial AN

what are all the organs

Difference between tretment design and experimental design

Conjoint analysis : The method used basically in market research which is similar in many respects to the various dimensional scaling. The method attempts to assign values to the l