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MarchelloO t1_jdrtqox wrote

Reply to comment by PredictorX1 in [OC] Relation between the square meter price of an apartment and distance from Notre Dame de Paris in Paris and Ile-de-France by sudu1988

Hi. Why the mean squared error and mean absolute error is important to know ?

I am learning Data Analysis so I would like to know to improve myself. Thanks in advance for the answer.

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morhe t1_jdu06dh wrote

You can draw any line you want. From something crazy and nonsensical to something that looks nice and smooth like the ones here. The fact that the lines “look” nice means nothing if they are not a realistic representation of the distribution of the data. So, the lines might be pretty but not significant but we can’t tell without a measure

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PredictorX1 t1_jdto5sc wrote

It doesn't have to be either of those two specific measures. I just want some way to quantify the quality of the fit to the data.

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Fa1nted_for_real t1_jdu4kkj wrote

Essentially, it tells you the accuracy of the line compared to the actual points.

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