What is the full name of CI? Let’s talk about the specific content.

CI (confidenceinterval) generally refers to the confidence interval.

The confidence interval is the estimated interval of the population parameter constructed from the sample statistic. In statistics, the confidence interval (Confidence interval) of a probability sample is an interval estimate of a certain population parameter of this sample.

Confidence interval is a commonly used interval estimation method. The so-called confidence interval is an interval composed of the upper and lower confidence limits of the statistics as the upper and lower bounds respectively.

For a given set of sample data, the mean is μ and the standard deviation is σ, then the 100(1-α)% confidence interval of the mean of the overall data is (μ-Ζα/ 2σ, μ+Ζα/2σ), where α is the coverage area of ??the non-confidence level within the normal distribution, and Ζα/2 is the corresponding standard score.

Extended information:

The confidence interval is the range in which the variable we calculated exists, and the confidence level is our degree of confidence that this value exists in the range we calculated.

For example, we are 95% sure that the real value is within the range we calculated.

Here, the confidence level is ninety-five and ninety percent, and the range we calculated is the confidence interval.

If the confidence level is 95%, sampling 100 times, and obtaining 100 confidence intervals, about 95 confidence intervals can cover the real parameter βk, which is essentially a random interval.

Baidu Encyclopedia-Confidence Interval