# qat_analyse_histogram_test_1d

From qat v0.74
0th

Percentile

##### Perform a histogram test with a given metric

This check divides the data into blocks, estimates their probability density functions by histograms and compares them by using a given metric.

Keywords
ts
##### Usage
qat_analyse_histogram_test_1d(measurement_vector,
co_measurement_vector=measurement_vector, metric="EMD", blocksize=100, numofbars=65,
factorofbar=100)
##### Arguments
measurement_vector
The measurement vector, which should be tested.
co_measurement_vector
An optional second measurement vector, which is compared to the first. The default is the first measurement vector.
metric
Metric of the comparison. Details see below.
blocksize
Number of elements, which should be used for each block.
numofbars
Number of bins of the histogram.
factorofbar
Correction factor for non-value bins.
##### Details

The field will be divided into blocks, with a length given by the parameter blocksize. From these blocks histograms are computed and afterwards compared. As a metric for the comparison one of the following five options are usable: EMD: Earth Mover's Distance (default); KLD: Kullback-Leibler Distance; JSD: Jenson-Shannon Distance; RMS: Root Mean Square; MS: Mean Square. As a result a field is generated, which includes the results of the comparison between every combination of blocks.

##### References

Duesterhus, A., Hense, A. (2012) Advanced Information Criterion for Environmental Data Quality Assurance, \_Advances in Science and Research\_, *8*, 99-104.

qat_analyse_histogram_test_2d

##### Aliases
• qat_analyse_histogram_test_1d
##### Examples
vec <- array(rnorm(1000), c(100, 20))
vec[51:100, ] <- vec[51:100, ] + 2
result <- qat_analyse_histogram_test_2d(vec, metric="EMD", blocksize=4, numofbars=65)
qat_plot_histogram_test(result$field, "test_emd_2d", result$blocksize, result$numofbars, "emd", result$runs)

Documentation reproduced from package qat, version 0.74, License: GPL-2

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