pprodnormal | R Documentation |
Generates percentiles (100 based quantiles) for the distribution of product of two normal random variables and the mediated effect
pprodnormal(
q,
mu.x,
mu.y,
se.x = 1,
se.y = 1,
rho = 0,
lower.tail = TRUE,
type = "dop",
n.mc = 1e+05
)
q |
quantile or value of the product |
mu.x |
mean of |
mu.y |
mean of |
se.x |
standard error (deviation) of |
se.y |
standard error (deviation) of |
rho |
correlation between |
lower.tail |
logical; if |
type |
method used to compute confidence interval. It takes on the
values |
n.mc |
when |
This function returns the percentile (probability) and the
associated error for the distribution of product of mediated effect (two
normal random variables). To obtain a percentile using a specific method,
the argument type
should be specified. The default method is
type="dop"
, which is based on the method described by Meeker and
Escobar (1994) to evaluate the CDF of the distribution of product of two
normal random variables. type="MC"
uses the Monte Carlo approach
(Tofighi & MacKinnon, 2011). type="all"
prints percentiles using all
three options. For the method type="dop"
, the error is the modulus
of absolute error for the numerical integration (for more information see
Meeker and Escobar, 1994). For type="MC"
, the error refers to the
Monte Carlo error.
An object of the type list
that contains the
following values:
p |
probability (percentile) corresponding to
quantile |
error |
estimate of the absolute error |
Davood Tofighi dtofighi@gmail.com
Tofighi, D. and MacKinnon, D. P. (2011). RMediation: An R package for mediation analysis confidence intervals. Behavior Research Methods, 43, 692–700. doi:10.3758/s13428-011-0076-x
medci
RMediation-package
pprodnormal(q = 0, mu.x = .5, mu.y = .3, se.x = 1, se.y = 1, rho = 0, type = "all")
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