Smooth function with optional grouping

This produces loess smoothed estimates of y with Student confidence intervals.

Usage

get_smooths(df, x, y, groups = NULL, level = 0.95)

Arguments

df

(data.frame)
data set containing all analysis variables.

x

(string)
x column name.

y

(string)
y column name.

groups

(character or NULL)
vector with optional grouping variables names.

level

(proportion)
level of confidence interval to use (0.95 by default).

Value

A data.frame with original x, smoothed y, ylow, and yhigh, and optional groups variables formatted as factor type.