ema.powercurve: Create power curves for EMA data

Description Usage Arguments Value Examples

View source: R/powercurve.R

Description

This allows you to estimate power to detect an effect at three standard effect sizes (d = 0.2, 0.5, and 0.8). It uses the smpsize_lmm function from sjstats to generate data for the curves and ggplot2 to plot them.

Usage

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ema.powercurve(NumbPart, NumbResp, days, respday, Est_ICC = 0.05,
  COL.8 = "red", COL.5 = "blue", COL.2 = "green")

Arguments

NumbPart

Total number of participants (i.e., level-2 unit)

NumbResp

Total max number of responses per participant (e.g., number of days * number of responses per day). You can either enter this OR enter number of days and number of responses per day manually. If all are entered, it will default to NumbResp.

days

Maximum number of days in study.

respday

Maximum number of responses per day.

Est_ICC

Estimated model ICC. Defaults to .05, but you should use a priori information from prior studies.

COL.8

Color of line for large (d=.8) effect size. Defualt is red, but you can specify colors by name or by hex code (make sure to put colors in quotation marks).

COL.5

Color of line for medium (d=.5) effect size. Defualt is blue, but you can specify colors by name or by hex code (make sure to put colors in quotation marks).

COL.2

Color of line for small (d=.2) effect size. Defualt is green, but you can specify colors by name or by hex code (make sure to put colors in quotation marks).

Value

A ggplot object that displays power curves at three effect sizes (d=.2,.5,.8).

Examples

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## Not run: ema.powercurve(NumbPart=80,days=30,respday=3)
 ## Not run: ema.powercurve(NumbPart=80,NumbResp=200)
  ## Not run: ema.powercurve(NumbPart=80,NumbResp=200,COL.8="orange")
  ## Not run: ema.powercurve(NumbPart=80,NumbResp=200,COL.8="orange",COL.5="#FF5733",COL.3="#8E44AD")

ekleiman1/EMAtools documentation built on May 20, 2019, 5:05 p.m.