Re:Ask HN: As a data scientist, what should be in my toolkit...
by Balgair on Tuesday February 20, 2018 @02:42PM
(#16423458)
> ... of data w/out with only basic operators... (emphasis mine)
I'm having a little trouble trying to parse that sentence. Could you explain it better?
Based on what I think is being asked, the question is essentially: What is a STD? I think this is a very straightforward and fair question.
For less Stat-y HNers: For normally distributed data, the STD is the root of the Variance. The Variance is just the average of the square of the difference between the data points to the mean. Essentially: Take a point, find the distance to the mean, square that, average over all points you've done that to. That's the variance. Root the variance, that's the STD.
I'm having a little trouble trying to parse that sentence. Could you explain it better?
Based on what I think is being asked, the question is essentially: What is a STD? I think this is a very straightforward and fair question.
For less Stat-y HNers: For normally distributed data, the STD is the root of the Variance. The Variance is just the average of the square of the difference between the data points to the mean. Essentially: Take a point, find the distance to the mean, square that, average over all points you've done that to. That's the variance. Root the variance, that's the STD.