Sunday

January 25, 2015

January 25, 2015

Posted by **Anonymous** on Tuesday, December 25, 2007 at 7:09pm.

a. the value of r^2

b. the slope of its residual plot

c. the existence of influential points

d. the existence of pattern in the residual points

e. all of these are considerations

I think the answer is e.

a. Since r^2 is a common method of 'measuring' the goodness of fit,

obviously this cannot be a correct answer option.

b. If the regression is 'good', then the residuals will cluster about the

x-axis, or at least average the x-axis. A regression line for the

residuals, then, should have a slope of or about m = 0. So this IS a

consideration.

c. Influential points are not outliers; they cannot safely be discarded. They tend, by their nature, to reduce the ability of the modelling method to produce a good fit, but only in comparison to the data set without that point.

d. If there is a pattern, then probably some other sort of regression would be a better fit. So looking for a pattern IS a consideration, and this

cannot be a correct option.

- statistics -
**drwls**, Wednesday, December 26, 2007 at 4:50pmYour arguments sound convincing, although I am not familiar with "influential" points, so I also think (e) is the correct answer,

**Answer this Question**

**Related Questions**

statistic - A linear model for a set of data was y = –20.6 + 9.72x and produced ...

statistics - In the following regression, X = total assets ($ billions), Y = ...

statistics - In a goodness-of-fit test where the sample size is 200, there are 5...

statistics - Pre study scores versus post-study scores for a class of 120 ...

Statistics - True or False 1. Chi square tests of independence and homogeneity ...

statistics - The following data on the number of iron workers in the United ...

Statistics (Please help!!!) - Here is the question: If gene frequencies are in ...

physics - You create a plot of T2 (in s2) vs mass (in kg) and the linear fit of ...

Physics - When a baseball is tossed directly upward, what is the slope of a plot...

Statistics - In a particular chi-square goodness-of-fit test there are four ...