[R] fit a time varying coefficient log linear model in r

Hello, all, Does anyone know any package in r to fit a log linear model with time varying coefficients in R? I have googled but with no results. Your help will be appreciated. J Shan Xiao Ph.D. student of Biostatistics, Department of Biostatistics, IUPUI. [[alternative HTML

[R] constructing a daily time series

Dear all, I have a vector of observations through day, and based on it, I try to construct a daily time series with the R function ts(), but it seems that it only enables to construct a weekly, monthly, quarterly and yearly time series, does anyone know whether there is an option to build a da

[R] plot discrete time series against time

Dear all, I try to plot some discrete time series data through time, of course I can achieve it by using the combination of some basic R functions, but it is not that convenient, does anyone know any R-inbuilt function to do it? Best. Shan Xiao Ph.D. student of Biostatistics, Departmen