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April 20, 2026, 12:43:30 pm
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Author Topic: Residual Plot in the SAC - Help!  (Read 1528 times)  Share 

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Christiano

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Residual Plot in the SAC - Help!
« on: May 09, 2011, 07:08:30 pm »
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I'm in the middle of the SAC and I can't tell if this has a random distribution or not. The coefficient of determination for the scatterplot was 78.5%. What is it?!   :-\
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sam.utute

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Re: Residual Plot in the SAC - Help!
« Reply #1 on: May 09, 2011, 09:57:46 pm »
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Seems pretty random to me. The fact that the r value is above 0.8 indicates that there's a pretty strong correlation between the variables.
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Christiano

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Re: Residual Plot in the SAC - Help!
« Reply #2 on: May 09, 2011, 10:16:40 pm »
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Doesn't it seem like there's an arc in the shape of a u (upside down)?
« Last Edit: May 09, 2011, 10:22:05 pm by Christiano »
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onur369

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Re: Residual Plot in the SAC - Help!
« Reply #3 on: May 09, 2011, 10:23:31 pm »
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Thats definitely linear, If the coefficient of determination is 75% and over its considered linear, plus there is not much of a parabolic shape.
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schnappy

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Re: Residual Plot in the SAC - Help!
« Reply #4 on: May 17, 2011, 11:48:37 pm »
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Quote from: onur369 on May 09, 2011, 10:23:31 pm
Thats definitely linear, If the coefficient of determination is 75% and over its considered linear, plus there is not much of a parabolic shape.

No it's not. If you have a small data set, you can still observe non-linearity for r values above 0.9 even... do some fancy transformations and you can go from r=0.9 to r=0.99 :)

@OP: I think you'd be pulling at strings to say it's non-linear, though you could maybe argue it's non-linear by the very slight 'U' you've mentioned.
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steve030

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Re: Residual Plot in the SAC - Help!
« Reply #5 on: June 09, 2011, 07:59:28 pm »
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Sporadic = aka random :)
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