design_matrix: Create a design matrix for a single-case design

In scdhlm: Estimating Hierarchical Linear Models for Single-Case Designs

Description

Create a design matrix containing a linear trend, a treatment effect, and a trend-by-treatment interaction for a single-case design with m cases and n measurement occasions.

Usage

design_matrix(m, n, treat_times = n/2 + 1, center = 0)

Arguments

m	number of cases
n	number of time points
treat_times	(Optional) vector of length m listing treatment introduction times for each case.
center	centering point for time trend.

Value

A design matrix

Examples

design_matrix(3, 16, c(5,9,13))

Example output

Loading required package: nlme
   id constant treatment trend interaction
1   1        1         0     1           0
2   1        1         0     2           0
3   1        1         0     3           0
4   1        1         0     4           0
5   1        1         1     5           1
6   1        1         1     6           2
7   1        1         1     7           3
8   1        1         1     8           4
9   1        1         1     9           5
10  1        1         1    10           6
11  1        1         1    11           7
12  1        1         1    12           8
13  1        1         1    13           9
14  1        1         1    14          10
15  1        1         1    15          11
16  1        1         1    16          12
17  2        1         0     1           0
18  2        1         0     2           0
19  2        1         0     3           0
20  2        1         0     4           0
21  2        1         0     5           0
22  2        1         0     6           0
23  2        1         0     7           0
24  2        1         0     8           0
25  2        1         1     9           1
26  2        1         1    10           2
27  2        1         1    11           3
28  2        1         1    12           4
29  2        1         1    13           5
30  2        1         1    14           6
31  2        1         1    15           7
32  2        1         1    16           8
33  3        1         0     1           0
34  3        1         0     2           0
35  3        1         0     3           0
36  3        1         0     4           0
37  3        1         0     5           0
38  3        1         0     6           0
39  3        1         0     7           0
40  3        1         0     8           0
41  3        1         0     9           0
42  3        1         0    10           0
43  3        1         0    11           0
44  3        1         0    12           0
45  3        1         1    13           1
46  3        1         1    14           2
47  3        1         1    15           3
48  3        1         1    16           4

scdhlm documentation built on Jan. 13, 2021, 7:10 p.m.