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April 24, 2026, 09:20:12 pm
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Author Topic: is this graph linear or some sort of parabola?  (Read 1124 times)  Share 

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MagicGecko

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is this graph linear or some sort of parabola?
« on: March 12, 2012, 02:08:12 pm »
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http://s422.photobucket.com/albums/pp305/jigglefruit/?action=view&current=trend.png

at first i thouhgt it was linear but the residual plot resembled a bell curve, and since there is a clear pattern that means that the original graph (the one in the url) is not linear, but it still looks like a linear line to me  :-\

whats do you guyz think??
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MJRomeo81

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Re: is this graph linear or some sort of parabola?
« Reply #1 on: March 12, 2012, 02:10:13 pm »
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I think if the residual plot has a clear pattern (despite a linear looking graph) you have to declare it as non linear.
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MagicGecko

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Re: is this graph linear or some sort of parabola?
« Reply #2 on: March 12, 2012, 02:55:18 pm »
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Quote from: MJRomeo81 on March 12, 2012, 02:10:13 pm
I think if the residual plot has a clear pattern (despite a linear looking graph) you have to declare it as non linear.

really? ok i guess that kinda makes sense! thanks!! ;D
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MJRomeo81

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Re: is this graph linear or some sort of parabola?
« Reply #3 on: March 12, 2012, 07:31:45 pm »
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From last year I definitely remember clear pattern in the residual plot = must do a transformation. I think some exercises purposely have linear looking graphs just to confuse students.
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Currently working in the IT Industry as an Oracle DBA (State Government)

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Bachelor of Information Technology @ La Trobe (Melbourne) - Completed 2014
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