How to find the change location is a series of data points

2 次查看（过去 30 天）

Yong 2021-10-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1569883-how-to-find-the-change-location-is-a-series-of-data-points

评论： Ive J 2021-10-24

I have sequences of data points such as the following:

x = [100.0 13.2 63.6 5.2 0.6 0.2 0.2 0.4 0.2 0.2 0.2 0 0.2 0 0]

I need to find the change point of the sequence. By examing the data sequence, it should be at location 5. However, the following command returns the change point location is 14:

idx = findchangepts(x, 'Statistic', 'rms')

My question: which is the better way to segment data points in a sequence like this?

Thanks a lot in advance!

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Ive J 2021-10-24

在 MATLAB Online 中打开

There is no magic way to determine this point of interest, because it heavily depends on lots of variables (e.g. your research question, the nature of data, etc). findchangepts shows the point (assuming only one such a point exsits) at which there is a change based on the criteria defined in Statistic. You can also set MinDistance (by default it's 2 for rms).

x = [100.0   13.2   63.6    5.2    0.6    0.2    0.2    0.4    0.2    0.2    0.2     0    0.2   0   0];
idx = findchangepts(x, 'Statistic', 'rms', 'MinDistance', 3) 
idx = 5

请先登录，再进行评论。

请先登录，再回答此问题。