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During 30 years as a professional statistician, I have never come across such a strange practice. The only thing that I can think of is that it is a flawed attempt to avoid division by zero. That, of course, is based on an assumption that the singularity is at zero.

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7y ago
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Q: What is the significance of adding 0.000001 to 0 for the first data point when graphing regressions on a calculator?
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