I wasn't able to make it to the review session yesterday and am not yet added to this blog, but have two questions:
1.) What is the difference between the lowess line and the line of least squares, or is there a difference?
2.) On our slides 4/2/11, p. 2, slide "Standard Deviation and IQR," Dr. Kim says the IQR is "robust than total range"... does he mean more robust than or less than?
I'm sorry that no one was able to post an answer in time for your exam, but it shouldn't have affected you too much.
1) The least squares line is a straight line that can be defined by 2 parameters (slope and intercept). The lowess line is smooth but can be curved and non-linear. It's more specific to a particular data set.
2) IQR is more robust than total range since it isn't affected by outliers.
3 comments:
Hi Nikki,
I wasn't able to make it to the review session yesterday and am not yet added to this blog, but have two questions:
1.) What is the difference between the lowess line and the line of least squares, or is there a difference?
2.) On our slides 4/2/11, p. 2, slide "Standard Deviation and IQR," Dr. Kim says the IQR is "robust than total range"... does he mean more robust than or less than?
Thanks!
Brooke
I'm sorry that no one was able to post an answer in time for your exam, but it shouldn't have affected you too much.
1) The least squares line is a straight line that can be defined by 2 parameters (slope and intercept). The lowess line is smooth but can be curved and non-linear. It's more specific to a particular data set.
2) IQR is more robust than total range since it isn't affected by outliers.
Thanks!
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