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In: Inter-university Consortium for Political and Social Research [distributor]

More participants in the NRT arm answered the follow-up calls only after delivery, although the difference did not reach statistical significance and the time lapse between delivery and follow-up was shorter in the NRT arm (Supplementary Table 7)

# Install packages if needed cran_packages 0) install.packages(missing) library(SDPDmod) library(plm) library(ggplot2) library(reshape2) library(dplyr) 3.2 Load and prepare the Cigar dataset The Cigar dataset (Baltagi, 1992) contains panel data on cigarette consumption in 46 US states from 1963 to 1992