generateDiscreteData {ASSISTant} R Documentation

## A data generation function using a discrete distribution for Rankin score rather than a normal distribution

### Description

A data generation function using a discrete distribution for Rankin score rather than a normal distribution

### Usage

```generateDiscreteData(prevalence, N, support = 0L:6L, ctlDist, trtDist)
```

### Arguments

 `prevalence` a vector of group prevalences (length denoted by J below) `N` the sample size to generate `support` the support values of the discrete distribution (length K), default 0:6 `ctlDist` a probability vector of length K denoting the Rankin score distribution for control. `trtDist` an K x J probability matrix with each column is the Rankin distribution for the associated group

### Value

a three-column data frame of `subGroup`, `trt` (0 or 1), and `score`

### Examples

```# Simulate data from a discrete distribution for the Rankin scores,
# which are typically ordinal integers from 0 to 6 in the following
# simulations. So we define a few scenarios.
library(ASSISTant)
null.uniform <- rep(1, 7L) ## uniform on 7 support points
hourglass <- c(1, 2, 2, 1, 2, 2, 1)
inverted.hourglass <- c(2, 1, 1, 2, 1, 1, 2)
bottom.heavy <- c(2, 2, 2, 1, 1, 1, 1)
bottom.heavier <- c(3, 3, 2, 2, 1, 1, 1)
top.heavy <- c(1, 1, 1, 1, 2, 2, 2)
top.heavier <- c(1, 1, 1, 2, 2, 3, 3)
ctlDist <- null.uniform
trtDist <- cbind(null.uniform, null.uniform, hourglass, hourglass) ## 4 groups
generateDiscreteData(prevalence = rep(1, 4), N = 10, ctlDist = ctlDist,
trtDist = trtDist) ## default support is 0:6
trtDist <- cbind(bottom.heavy, bottom.heavy, top.heavy, top.heavy)
generateDiscreteData(prevalence = rep(1, 4), N = 10, ctlDist = ctlDist,
trtDist = trtDist)
support <- c(-2, -1, 0, 1, 2) ## Support of distribution
top.loaded <- c(1, 1, 1, 3, 3) ## Top is heavier
ctl.dist <- c(1, 1, 1, 1, 1) ## null on 5 support points
trt.dist <- cbind(ctl.dist, ctl.dist, top.loaded) ## 3 groups
generateDiscreteData(prevalence = rep(1, 3), N = 10, support = support,
ctlDist = ctl.dist, trtDist = trt.dist)
```

[Package ASSISTant version 1.4.2 Index]