R/print.R

In epigrowthfit: Nonlinear Mixed Effects Models of Epidemic Growth

print.egf <-
function(x, width = 0.9 * getOption("width"), indent = 2L, ...) {
	width <- as.integer(width)
	indent <- strrep(" ", indent)


	## Set up ==========================================================

	## Top level nonlinear model
	mu <- quote(f(t) - f(s))
	if (x[["model"]][["day_of_week"]])
		mu <- call("*", quote(w(s, t)), mu)
	e1 <- call("~",
	           quote(X(s, t)),
	           switch(x[["model"]][["family"]],
	                  pois = call("dpois", lambda = mu),
	                  nbinom = call("dnbinom", mu = mu, size = quote(disp))))
	e2 <- call("=",
	           quote(f(t)),
	           switch(x[["model"]][["curve"]],
	                  exponential = quote(c0 * exp(r * t)),
	                  subexponential = quote(c0 * (1 + alpha * (1 - p) * t / c0^(1 - p))^(1 / (1 - p))),
	                  gompertz = quote(K * exp(-exp(-alpha * (t - tinfl)))),
	                  logistic = quote(K / (1 + exp(-r * (t - tinfl)))),
	                  richards = quote(K / (1 + a * exp(-a * r * (t - tinfl)))^(1 / a))))
	if (x[["model"]][["excess"]])
		e2[[3L]] <- call("+", quote(b * t), e2[[3L]])
	lines.top <- c(deparse(e1), "where", deparse(e2))

	## Bottom level mixed effects model
	line <-
	function(s, offset) {
		formula <- call("~", str2lang(s), formula(x, top = s)[[2L]])
		paste0(strrep(" ", offset), paste0(deparse(formula), collapse = "\n"))
	}
	offset <-
	function(s)
		max(n <- nchar(s)) - n
	top <- egf_top(x)
	lines.bottom <- mapply(line, top, offset(top))

	## Number of observations
	frame <- model.frame(x)
	n <- c(sum(!is.na(frame[["x"]])),
	       nlevels(frame[["window"]]),
	       nlevels(frame[["ts"]]))
	c1 <- sprintf("%d", n)
	c2 <- c("observation", "fitting window", "time series")
	c2[1:2] <- pluralize(c2[1:2], n[1:2])
	lines.nobs <- align(c1, c2, justify = c("r", "l"))


	## Write to stdout  ================================================

	heading("Top level nonlinear model", width = width)
	cat("\n")
	writeLines(paste0(indent, lines.top))
	cat("\n")
	str(x[["model"]], no.list = TRUE, indent.str = indent, give.head = FALSE)
	cat("\n")

	heading("Bottom level mixed effects model", width = width)
	cat("\n")
	writeLines(paste0(indent, lines.bottom))
	cat("\n")

	heading("Data", width = width)
	cat("\n")
	writeLines(paste0(indent, lines.nobs))

	invisible(x)
}

print.egf_no_fit <- print.egf