# Compute Hierarchy of an HBM

### Description

`hierarchy`

computes the hierarchy of a hierarchical block matrix computed with `hbm`

.

### Usage

1 | ```
hierarchy(hm)
``` |

### Arguments

`hm` |
a hierarchical block matrix computed with |

### Details

In a hierarchical matrix, computed with `hbm`

, the behavior around the diagonal reflects the hierarchy of the association matrix. Specifically, for a hierarchical fractal-like structure we expect a non-decreasing series in the upper triangle of the matrix and a non-increasing series in the lower triangle. `hierarchy`

counts the number of deviations from this behavior for each node: number of negative successive differences up to the diagonal and number of positive successive changes after the diagonal, and returns the negation of the mean number of changes across nodes.

### Value

`hierarchy`

returns a numeric value giving the hierarchy of the matrix.

### Author(s)

Yoli Shavit

### References

`hbm`

's website: http://www.cl.cam.ac.uk/~ys388/hbm/

### See Also

`generate.random.conf`

to see how to generate interesting chains

`hbm`

learn how to build hierarchical block matrices

`hbm`

's tutorials at http://www.cl.cam.ac.uk/~ys388/hbm/

### Examples

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | ```
set.seed(2)
n = 100 # chain size
#generate configurations
conf = generate.random.conf(n, sd = 0.5, scale = FALSE)
#perturb the chain
conf.perturb.all = generate.random.conf(n, perturb = 1:n, sd = 0.5, scale = FALSE)
# and again with less perturbration
conf.perturb = generate.random.conf(n, perturb = 10:50, sd = 0.5, scale = FALSE)
# compute the HBMs
hm.control = hbm(exp(-1*as.matrix(dist(conf))), 2)$hm
hm.perturb.all = hbm(exp(-1*as.matrix(dist(conf.perturb.all))), 2)$hm
hm.perturb = hbm(exp(-1*as.matrix(dist(conf.perturb))), 2)$hm
h.control = hierarchy(hm.control)
h.perturb = hierarchy(hm.perturb)
h.perturb.all = hierarchy(hm.perturb.all)
h = c(h.control, h.perturb, h.perturb.all)
# plot
plot(1:3, h, pch = 19, cex = 2, axes = FALSE, ylab = "Chain Hierarchy", xlab = "Condition")
axis(1, at = 1:3, labels = c("Control", "Perturbed-Partial", "Perturbed-All"))
axis(2)
``` |

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