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Feb 28 at 8:35 comment added CaroZ What is it you call "time occurrence" ? For the mathematical reason, see Frank Harrell's answer above. I can only tell you an answer based on common sense : if something is present almost everywhere, you do not have enough cases of non-occurrence to estimate the probability of non-occurrence. It would be a case of really wanting to fit an analysis in somewhere where a simple description of what you observe would be accurate.
Feb 27 at 12:13 comment added zhiheng yi Because I am a beginner in statistics, and my methods are based on referencing papers from similar researchers, so there may be many errors. I am curious, is it unreasonable to analyze the presence of MP based on the assumption of a high probability of time occurrence (80%)? What are the specific reasons for this?
Feb 27 at 12:13 history edited CaroZ CC BY-SA 4.0
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Feb 27 at 12:05 history edited CaroZ CC BY-SA 4.0
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Feb 27 at 12:04 comment added CaroZ So then why do you want to analyse it as presence/absence when it is obviously almost always present ?
Feb 27 at 11:59 comment added zhiheng yi The concentration of MP is also one of the outcome variables, which is a continuous variable. Therefore, we have already used a multiple linear regression model for statistical analysis.
Feb 27 at 11:58 history edited CaroZ CC BY-SA 4.0
Made it an answer instead of a comment
Feb 27 at 11:51 comment added Stephan Kolassa This sounds more like a comment than an answer.
Feb 27 at 11:50 history answered CaroZ CC BY-SA 4.0