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No it doesn't. The exponential distribution p.d.f. is decreasing. http://en.wikipedia.org/wiki/Exponential_distribution#mediaviewer/File:Exponential_pdf.svg htt
by murbard2 12y ago
No it doesn't. The exponential distribution p.d.f. is decreasing.
http://en.wikipedia.org/wiki/Exponential_distribution#mediaviewer/File:Exponential_pdf.svg http://en.wikipedia.org/wiki/Exponential_distribution#mediav...
- revelation 12y agoBut that's not what we are interested in, no? Nobody asks "whats the probability that you'll get cancer at precisely age x", they ask "what's the probabiblity that you'll have cancer by age x". I mean, we often can't even determine at what precise age the cancer developed. That's a problem for the PDF, not so much the CDF.
- murbard2 12y agoThe graph I linked to plots the PDF. It's not exponential. It indicates something is getting worse over time.