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The data in the data frame asset are from Myers (1990), \Classical and Modern Regression with Applications (Second Edition)," Duxbury. The response y here is rm return on assets for thirty companies in 1982. We wish to predict the response in terms of the predictors x1-x7. Fit a linear model including all the predictors. Use the drop1 command to rank models obtained from the original model by deleting one predictor variable. If the model can be improved by deletion of a variable, t the reduced model. Iterate this procedure of examining one variable deletions until the model can no longer be improved (according to AIC) by any one variable deletion. For the nal model, plot diagnostic quantities and comment on these plots.
Chemical processors manufacture wondercool using two processes- mixing and distillation. The following details relate to the distillation process for a period. No opening work i
a) What is meant by secular trend? Discuss any two methods of isolating trend values in a time series.
Calculation for Continuous Series or Grouped Data = where, m = mid-point of class =
Analysis of covariance (ANCOVA) It is initially used for an expansion of the analysis of variance which permits to the possible effects of continuous concomitant variables (suc
PCA is a linear transformation that transforms the data to a new coordinate system such that the greatest variance by any projection of the data comes to lie on the first coordinat
In 120 tosses of a coin, 45 heads and 75 tails are observed. Is this a balanced coin? Use a=0.05. (Follow the basic steps of hypothesis testing)
simplified formulae
Other Measures of Dispersion In this section, we look at relatively less used measures of dispersion like fractiles, deciles, percentiles, quartiles, interquartile range and f
Random Sampling Method In this method the units are selected in such a way that every item in the whole universe has an equal chance of being included. In the words of croxton
Measurement of trend , least square method
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