City_PriceToRentRatio_AllHomes %>%
group_by(RegionID, RegionName, State, Metro, CountyName, SizeRank) %>%
summarise(Nobs = n()) %>%
arrange(SizeRank) %>%
{if (is_html_output()) datatable(., filter = 'top', rownames = F) else .}City_PriceToRentRatio_AllHomes %>%
group_by(date) %>%
summarise(Nobs = n()) %>%
{if (is_html_output()) datatable(., filter = 'top', rownames = F) else .}