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first time
Events are often triggered when a stochastic or random process first encounters a threshold. The threshold can be a barrier, boundary or specified state of a system. The amount of time required for a stochastic process, starting from some initial state, to encounter a threshold for the first time is referred to variously as a first hitting time.
In statistics, first-hitting-time models are a sub-class of survival models. The first hitting time, also called first passage time, of the barrier set
B
{\displaystyle B}
with respect to an instance of a stochastic process is the time until the stochastic process first enters
B
{\displaystyle B}
.
More colloquially, a first passage time in a stochastic system, is the time taken for a state variable to reach a certain value. Understanding this metric allows one to further understand the physical system under observation, and as such has been the topic of research in very diverse fields, from economics to ecology.The idea that a first hitting time of a stochastic process might describe the time to occurrence of an event has a long history, starting with an interest in the first passage time of Wiener diffusion processes in economics and then in physics in the early 1900s. Modeling the probability of financial ruin as a first passage time was an early application in the field of insurance. An interest in the mathematical properties of first-hitting-times and statistical models and methods for analysis of survival data appeared steadily between the middle and end of the 20th century.
This is for a friend here in Aloha. He is building his first underfolder and has run into issues folding his flats and installing the trunions. Does anyone local have a press for him to do the barrel and the trunions? Anyone that's done this a couple times we'd love some advice.
So.............. Reading through the requirements to get a Concealed weapons permit, I'm seeing a lot on this proof of Proficiency crap. (Sorry I'm of the crowd the believes the second amendment is our permit)..., But I've seen that. So my question is how does one go about getting that? I've...
We are going to be doing some rifle classes in the spring and summer, and I know that some of you are buying, building or getting one of these fine rifles for Christmas. So as my company's gift to everyone here on the forum, let me present an introduction to the AR-15 and what the care and...