Confusing in this matter (see previous video too) is it uses two concepts of time, one as an interval and one as a point in time (deaths occur between, say, t=0 and t=1, but the numbers are treated as if the are a point in time; Nt is acually the number at t=0, the risk ending at t=1, so until, not on t=1). Even more confusing is the textbook using t+1 in formulas, instead of t-1 (which this video does, and imo is the right way). You see this in the (excell) examples, where N0=N1. What happens between 0 and 1? But, nice, clear video.
To be more specific: a t=1 you inventarise your deaths and censoreds that happened between t=0 and t=1 and relate them (strictly) to the N at risk, which is N0, the number that were there at t=0 (which is called N1 for convenience). But I understand it's a matter of convention. It makes reproducing (copuing) tables not too hard, but if you try to make one from scratch, like I did, you get stuck. Video like this come in more than handy, they are necessary imo.
![Survival Analysis [Simply Explained]](http://i.ytimg.com/vi/Wo9RNcHM_bs/mqdefault.jpg)
![Survival Analysis [Simply Explained]](/img/tr.png)
Very clear. Thank you so much
Wow thanks so much! This help me create the table for future use! Awesome explanation!!!
Thanks Dr Lori
Can you please show us how to do the confidence intervals for the life table?
thanks
Thanks for the great video.
Confusing in this matter (see previous video too) is it uses two concepts of time, one as an interval and one as a point in time (deaths occur between, say, t=0 and t=1, but the numbers are treated as if the are a point in time; Nt is acually the number at t=0, the risk ending at t=1, so until, not on t=1). Even more confusing is the textbook using t+1 in formulas, instead of t-1 (which this video does, and imo is the right way). You see this in the (excell) examples, where N0=N1. What happens between 0 and 1? But, nice, clear video.
To be more specific: a t=1 you inventarise your deaths and censoreds that happened between t=0 and t=1 and relate them (strictly) to the N at risk, which is N0, the number that were there at t=0 (which is called N1 for convenience). But I understand it's a matter of convention. It makes reproducing (copuing) tables not too hard, but if you try to make one from scratch, like I did, you get stuck. Video like this come in more than handy, they are necessary imo.
Where is first video?
lori very nice good voice. looking very tried