search for: usefful

...; if theora use one. and stuff like that. So where can I find it ? I have read the specification of theora and spend a long time looking over internet for this information but i couldn't find anything except that the header does not contain the number of frame because theora is supposed to be usefful to streaming. To my mind, most of the streamed video are finished files, there are a just a few streaming of pure video stream (like webcam, or tv channel) and the fact is knowing the number of frame (when it's possible) is really usefull. So why don't you put it in the header and give it a...

Hello R-users, I have been trying to fit what I think is a simple mixed-effects model using lmer (from lme4), but I've run into some difficulty that I have not been able to resolve using the existing archives or Pinheiro and Bates (2000). I am measuring populations (of birds) which change with time at a number of different sites. These sites are grouped into regions. Sites are not measured

lag is a very confusing function i try to plot lag(x,-h) and y , the results are the same figures for all the h lags. then i saw online people use lag(x,-h) as xreg in arima that won't work in my eyes if lag function is consistent, isnce it returns the same value for all the lags i don't know in which occasion people will use this function besides I suppose Lag(x,h) is the same as