Standard deviation and standard error
First, the standard error and the standard deviation are in order-personal understanding
, the standard deviation is followed by the standard error
Standard deviation definition
The square root of the arithmetic mean of the standard deviation of each unit of the population and the square of the mean of the mean is the square root of the square of the difference
between the n samples taken or the n results measured from the mean
A measure of the degree of dispersion of n samples relative to their average, the smaller the mean, the more representative
Standard deviation = square root of variance
Standard deviation formula / N = n-1 if the sample standard deviation
Definition of mislabeling
Calculate the mean of n samples drawn k times, or n results obtained from k measurements, and find the standard deviation of k means, which is the standard error
Evaluation of the reliability of the measurement results, that is, the representative value of the sample mean to the overall mean
