Bio-statistics Essay Example | Topics and Well Written Essays - 1000 words

Bio-statistics - Essay ExampleIt can be either analog or subtractive. In case of additive procedure, the significant predictive variables be included in the infantile fixation model one after another. In case of subtractive approach all the expected variables are included in the model and then those which do not show statistically significant tie beam with the predicted variable are dropped from the equation.In univariate analyses each variable is analysed separately for its statistics like mean, median, mode, standard deviation, range, skewness etcetera Association on the other hand comes by looking at trend in the midst of deuce variables. If values of two variables show a tandem movement, then in that respect exists significant association between the two variables. Though it looks very similar to correlation, it is completely different as in case of association, there may not be any causal kindred between two variables, which is there in case of correlation.What has been stated in the quoted sentence is that univariate analysis resulted in significant association between allogeneic blood transfusion and older age allogeneic transfusion and female sex allogeneic transfusion and hip procedure and so on. It mean that instances of allogeneic transfusion were more in older people, females and so on. But it does not necessarily mean that this relationship was causal as well, it may be or may not be.g) Revision hip was associated with the highest chance of transfusion as Risk ratio is highest for this procedure. This means that those going for Revision hip are at the greatest risk of exposure for allogeneic transfusion than those going for other procedures.h) The older person (aged 77) is at greater risk of requiring a transfusion after operation than the younger one. This comes from the fact that the multivariate regression model throws up risk ratio of 1.77 for those aged from 70 80 as compared to that of those aged below 70.