Statisticiansplay a crucial role in the society. Below is an analysis of the mostfundamental components of statistics and their utilization in themodern society.
Compareand contrast the use of linear and multiple regression analyses
Instatistics, linear regression encompasses the modelling of how thedependent and the independent variables relate by the use of a linearfunction. In situations where two or more explanatory variables arefound to have a linear relationship with the prevailing dependentvariable, the regression is then termed as a multiple linearregression. On the other hand, multiple regression models are termedas a broader class or regressions that take into perspective linearand non-linear regressions with multiple explanatory variables.
Intheir study, Hasanpori, Tavili, and Javadi (2014), make use of themultiple regression models to study species density in Semi -AridRangelands. From their study, there is an incorporation of a widerange of explanatory variables that enhance the conclusion attained.Langohr and Melis, (2015) make use of a linear regression model toconduct an estimation and residual analysis using R.
Meaningof the simple coefficient of determination in general
Thecoefficient of determination is normally represented by R-squared,and it is a number that denotes the proportion of variance in thedependent variable and predictable from the independent variable.This is mainly used to predict research hypotheses and any futureoutcomes. A good example, on how the coefficient would have played amajor role is the prediction of the U.S. presidential outcomes.Further, the coefficient in addition to different regression modelswould suffice as an essential approach in predicting the economicoutcomes in the world if the U.S. economy declines due to thecontinued and developing fear among organizations owing to unexpectedchange in leadership (Hewson & MacGillivray, 2016).
Residualsare plotted against fitted values in a regression analysis model.
Thereare a number of ways of determining whether a residual plot violatesthe regression analysis model. Some of the main approaches include:
Unevenspread of residual across the fitted values. In this case the modeldoes not fit consistently at all the values of X. Further, if thereis a curvilinear pattern. This means that the model may be missing ahigher order term. Violation of the assumptions may occur insituations where outliers exist in the extreme Y value. This is tomean that there may be an underlying special cause that may includedata recording error. Another crucial aspect to note is theinfluential value of extreme X value. In this case an observation istermed or denoted to have a greater influence on the model ascompared to other observations (Neuhäuser, 2015).
F-testis normally used in the comparison of statistical models fitted to agiven set of data. This is an essential approach of trying toestablish the best model that fits the data used in a study. It isimperative for researchers to clearly authenticate their studies andensure that they correctly utilize the best methods possible in theresearch process.
Inconclusion, statistics is a fundamental component in the modernsociety. Through statistics, researchers can be able to gathercritical data to enhance decision making processes. Moreover, peopleare able to investigate prevailing problems and ensure that they getthe best results to harness viable strategies to solve such issues.
Hasanpori,R., Tavili, A., & Javadi, S. (2015). Study of Species Density inSemi-Arid Rangelands by Using Multiple-Linear RegressionAnalysis. Vegetos-An International Journal of Plant Research, 26(2),43. http://dx.doi.org/10.5958/j.2229-4473.26.2.052
Hewson,P. & MacGillivray, H. (2016). The pinnacle of statisticseducation is not a single hypothesis test. Teaching, 38(1),1-3. http://dx.doi.org/10.1111/test.12090
Langohr,K. & Melis, G. (2015). Estimation and residual analysis with Rfor a linear regression model with an interval-censoredcovariate. BiometricalJournal, 56(5),867-885. http://dx.doi.org/10.1002/bimj.201300204
Neuhäuser,M. (2015). Combining the t test and Wilcoxon`s rank-sum test. Journalof Applied , 42(12),2769-2775. http://dx.doi.org/10.1080/02664763.2015.1070809