Hi there,
I really don't know if I am at the right place to ask this, but I have datas (obs) from the past 5 years (each month = new data).
I want to use PROC ARIMA (I don't know how to use it very well, but I read it could be the good tool to do what I want) to know if the last data produced from last month (e.g. October) is "valid" within a forecast of past values.
By example, I have the number of obs (nobs) stocked in a dataset DATA1. I have 62 observations and I want to know if the 63rd is valid within the predicted values. My table DATA1 is updated monthly by adding a new line with the latest datas. The trend is that the nobs should always increase, but for quality control I'd like to validate that the new data is correct and within the "margins" of the past datas. If I'm not clear, do not hesitate since English is not my native language.
Is there a way to do that?