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I am performing atmospheric correction on a Landsat 8 image using different methods to check which one works best (in order to proceed with further/subsequent analysis). Wondering if it's okay to use as low as 5 observations (pixel points) for regression analysis (to check for agreement between Landsat, dependent variable and MODIS Surface Reflectance, independent variable).

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    Statistics says 10 in case of one independent variable – FelixIP Aug 6 '16 at 4:34

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