cogSlope: Compute Slope of Linear Fit Cognostic

In trelliscope: Create and Navigate Large Multi-Panel Visual Displays

Description

Compute the slope of a linear fit as a cognostic to be used in a trelliscope display.

Usage

cogSlope(..., desc = "Slope of fitted line", group = "common",
  defLabel = FALSE, defActive = TRUE, filterable = TRUE,
  sortable = TRUE, log = FALSE)

Arguments

desc, group, defLabel, defActive, filterable, sortable, log	arguments passed to cog
...	arguments to be passed to link{loess}, such as the formula, data, smoothing parameters, etc.

See Also

cog

Examples

d <- stack(data.frame(EuStockMarkets))
d$time <- rep(as.numeric(time(EuStockMarkets)), 4)
d$year <- floor(d$time)

byIndexYear <- divide(d, by = c("ind", "year"))

cogFn <- function(x)
  list(lormse = cogLoessRMSE(values ~ time, data = x, span = 0.3, degree = 2),
       slope  = cogSlope(values ~ time, data = x),
       range  = cogRange(x$values),
       mean   = cogMean(x$values),
       max    = cog(max(x$values, na.rm = TRUE), desc = "max value"))

applyCogFn(cogFn, byIndexYear[[1]])

library(lattice)
panelFn <- function(x)
  xyplot(values ~ time, data = x,
    panel = function(x, y, ...) {
      panel.xyplot(x, y, ...)
      panel.loess(x, y, span = 0.3,
        degree = 2, evaluation = 200, col = "black")
    })

vdbConn(tempfile(), autoYes = TRUE)
makeDisplay(byIndexYear, name = "ts_index_year",
  cogFn = cogFn, panelFn = panelFn)

## Not run: 
# sort and fiter the index/year panels by slope and loess RMSE
view(name = "ts_index_year")

## End(Not run)

trelliscope documentation built on Sept. 20, 2017, 5:04 p.m.