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A computational study on outliers in world music
The comparative analysis of world music cultures has been the focus of several ethnomusicological studies in the last century. With the advances of Music Information Retrieval and the increased accessibility of sound archives, large-scale analysis of world music with computational tools is today feasible. We investigate music similarity in a corpus of 8200 recordings of folk and traditional music from 137 countries around the world. In particular, we aim to identify music recordings that are most distinct compared to the rest of our corpus. We refer to these recordings as βoutliersβ. We use signal processing tools to extract music information from audio recordings, data mining to quantify similarity and detect outliers, and spatial statistics to account for geographical correlation. Our findings suggest that Botswana is the country with the most distinct recordings in the corpus and China is the country with the most distinct recordings when considering spatial correlation. Our analysis includes a comparison of musical attributes and styles that contribute to the βuniquenessβ of the music of each country
Methodology for outlier detection in k-dimensional space
ΠΡΠ΅Π΄ΠΌΠ΅Ρ ΠΈΡΡΡΠ°ΠΆΠΈΠ²Π°ΡΠ° ΠΎΠ²Π΅ Π΄ΠΎΠΊΡΠΎΡΡΠΊΠ΅ Π΄ΠΈΡΠ΅ΡΡΠ°ΡΠΈΡΠ΅ ΡΠ΅ ΡΠΎΡΠΌΠΈΡΠ°ΡΠ΅
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ Π·Π° ΠΎΡΠΊΡΠΈΠ²Π°ΡΠ΅ ΠΌΡΠ»ΡΠΈΠ²Π°ΡΠΈΡΠ°ΡΠΈΠΎΠ½ΠΈΡ
Π½Π΅ΡΡΠ°Π½Π΄Π°ΡΠ΄Π½ΠΈΡ
ΠΎΠΏΡΠ΅ΡΠ²Π°ΡΠΈΡΠ° ΠΊΡΠΎΠ·
ΡΠ½Π°ΠΏΡΠ΅ΡΠ΅ΡΠ΅ ΠΌΠ΅ΡΠΎΠ΄Π΅ ΠΠ²Π°Π½ΠΎΠ²ΠΈΡΠ΅Π²ΠΎΠ³ ΠΎΠ΄ΡΡΠΎΡΠ°ΡΠ°.
ΠΡΠΊΡΠΈΠ²Π°ΡΠ΅ Π½Π΅ΡΡΠ°Π½Π΄Π°ΡΠ΄Π½ΠΈΡ
ΠΎΠΏΡΠ΅ΡΠ²Π°ΡΠΈΡΠ° Ρ k-Π΄ΠΈΠΌΠ΅Π½Π·ΠΈΠΎΠ½ΠΎΠΌ ΠΏΡΠΎΡΡΠΎΡΡ ΡΠ΅
ΠΏΠΎΠ΄ΡΠ΅Π΄Π½Π°ΠΊΠΎ Π²Π°ΠΆΠ½ΠΎ ΠΊΠ°ΠΎ ΠΈ ΡΠΈΡ
ΠΎΠ²ΠΎ ΠΎΡΠΊΡΠΈΠ²Π°ΡΠ΅ Ρ ΡΠ΅Π΄Π½ΠΎΡ Π΄ΠΈΠΌΠ΅Π½Π·ΠΈΡΠΈ. ΠΠΎΠ΄ ΠΏΠΎΡΠΌΠΎΠΌ
βΠ½Π΅ΡΡΠ°Π½Π΄Π°ΡΠ΄Π½Π° ΠΎΠΏΡΠ΅ΡΠ²Π°ΡΠΈΡΠ°β ΡΠ΅ ΠΏΠΎΠ΄ΡΠ°Π·ΡΠΌΠ΅Π²Π° ΠΎΠ½Π° ΠΎΠΏΡΠ΅ΡΠ²Π°ΡΠΈΡΠ° ΠΊΠΎΡΠ° ΡΠ΅ Π½Π° Π½Π΅ΠΊΠΈ Π½Π°ΡΠΈΠ½
Π½Π΅ΠΊΠΎΠ½Π·ΠΈΡΡΠ΅Π½ΡΠ½Π° ΡΠ° ΠΏΡΠ΅ΠΎΡΡΠ°Π»ΠΈΠΌΠ° ΠΈΠ· ΠΏΠΎΡΠΌΠ°ΡΡΠ°Π½ΠΎΠ³ ΡΠΊΡΠΏΠ°. ΠΡΠΊΡΠΈΠ²Π°ΡΠ΅
ΠΌΡΠ»ΡΠΈΠ²Π°ΡΠΈΡΠ°ΡΠΈΠΎΠ½ΠΈΡ
Π½Π΅ΡΡΠ°Π½Π΄Π°ΡΠ΄Π½ΠΈΡ
ΠΎΠΏΡΠ΅ΡΠ²Π°ΡΠΈΡΠ° ΡΠ΅ Π½Π°ΡΡΠ΅ΡΡΠ΅ ΡΠΏΡΠΎΠ²ΠΎΠ΄ΠΈ ΠΊΠΎΡΠΈΡΡΠ΅ΡΠ΅ΠΌ
ΠΌΠ΅ΡΠΎΠ΄Π΅ ΠΠ°Ρ
Π°Π»Π°Π½ΠΎΠ±ΠΈΡΠΎΠ²ΠΎΠ³ ΠΎΠ΄ΡΡΠΎΡΠ°ΡΠ°.
ΠΠ²Π°Π½ΠΎΠ²ΠΈΡΠ΅Π²ΠΎ ΠΎΠ΄ΡΡΠΎΡΠ°ΡΠ΅ ΡΠ΅ ΠΊΠΎΡΠΈΡΡΠΈ Ρ ΡΠΈΡΡ ΠΌΠ΅ΡΠ΅ΡΠ° ΠΈΠ½ΡΠ΅Π½Π·ΠΈΡΠ΅ΡΠ° Π½Π΅ΠΊΠ΅ ΠΏΠΎΡΠ°Π²Π΅,
ΠΊΠΎΡΠΈΡΡΠ΅ΡΠ΅ΠΌ Π²Π΅ΡΠ΅Π³ Π±ΡΠΎΡΠ° ΠΈΠ·Π°Π±ΡΠ°Π½ΠΈΡ
ΠΈΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠ°. Π£Π½Π°ΠΏΡΠ΅ΡΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΠΠ²Π°Π½ΠΎΠ²ΠΈΡΠ΅Π²ΠΎΠ³
ΠΎΠ΄ΡΡΠΎΡΠ°ΡΠ° ΡΠ΅ΡΡΠΈΡΠ° Π·Π½Π°ΡΠ°ΡΠ½ΠΎΡΡ ΡΠ²Π°ΠΊΠΎΠ³ ΠΎΠ΄ ΠΏΠΎΡΠΌΠ°ΡΡΠ°Π½ΠΈΡ
ΠΈΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠ° ΠΊΠΎΡΠΈΡΡΠ΅ΡΠ΅ΠΌ
ΠΎΠ΄Π³ΠΎΠ²Π°ΡΠ°ΡΡΡΠ΅ F ΡΡΠ°ΡΠΈΡΡΠΈΠΊΠ΅. ΠΡΠΎΠ· ΡΠΏΠΎΡΡΠ΅Π±Ρ Π΄Π΅ΡΠΈΠ½ΠΈΡΠ°Π½ΠΈΡ
ΠΏΡΠΎΡΠ΅Π΄ΡΡΠ° Π·Π° Π΅Π»ΠΈΠΌΠΈΠ½Π°ΡΠΈΡΡ
ΠΈ/ΠΈΠ»ΠΈ ΡΠ΅Π»Π΅ΠΊΡΠΈΡΡ ΠΈΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠ°, Π½ΠΎΠ²Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠ΅ΠΆΠΈ ΡΠΎΡΠΌΠΈΡΠ°ΡΡ βΠΎΠΏΡΠΈΠΌΠ°Π»Π½ΠΎΠ³β ΡΠΊΡΠΏΠ°
ΠΈΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠ°, ΡΠ΅Π΄ΡΠΊΡΡΡΡΠΈ Π΄ΠΈΠΌΠ΅Π½Π·ΠΈΡΡ ΠΏΠΎΡΠΌΠ°ΡΡΠ°Π½ΠΎΠ³ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΎΠ³ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ°.
ΠΠ΅ΡΠΎΠ΄Π° ΡΠ΅ΠΊΠ²Π΅Π½ΡΠΈΡΠ°Π»Π½ΠΎΠ³ ΠΠ²Π°Π½ΠΎΠ²ΠΈΡΠ΅Π²ΠΎΠ³ ΠΎΠ΄ΡΡΠΎΡΠ°ΡΠ° ΡΠ·ΠΈΠΌΠ° Ρ ΠΎΠ±Π·ΠΈΡ
Π΄ΠΈΡΠΊΡΠΈΠΌΠΈΠ½Π°ΡΠΈΠΎΠ½Ρ ΠΌΠΎΡ ΡΠ²Π°ΠΊΠΎΠ³ ΠΎΠ΄ ΠΊΠΎΡΠΈΡΡΠ΅Π½ΠΈΡ
ΠΈΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠ°. Π£ ΡΠΊΠ»Π°Π΄Ρ Ρ ΡΠΈΠΌ, ΡΠΎΡΠΌΠΈΡΠ°
ΡΠ΅ ΡΠ΅Π΄ΠΈΠ½ΡΡΠ²Π΅Π½Π° Π²ΡΠ΅Π΄Π½ΠΎΡΡ ΠΎΠ΄ΡΡΠΎΡΠ°ΡΠ° Π·Π° ΡΠ²Π°ΠΊΡ ΠΎΠΏΡΠ΅ΡΠ²Π°ΡΠΈΡΡ ΠΈΠ· ΠΏΠΎΡΠΌΠ°ΡΡΠ°Π½ΠΎΠ³ ΡΠΊΡΠΏΠ°.
Π Π΅Π·ΡΠ»ΡΠ°ΡΠΈ ΠΈΡΡΡΠ°ΠΆΠΈΠ²Π°ΡΠ° ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΈ ΡΡ Π΄Π° ΡΠ΅ ΠΎΠ²Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΠΌΠΎΠΆΠ΅ ΡΡΠΏΠ΅ΡΠ½ΠΎ ΠΊΠΎΡΠΈΡΡΠΈΡΠΈ Π·Π°
ΠΎΡΠΊΡΠΈΠ²Π°ΡΠ΅ ΠΌΡΠ»ΡΠΈΠ²Π°ΡΠΈΡΠ°ΡΠΈΠΎΠ½ΠΈΡ
Π½Π΅ΡΡΠ°Π½Π΄Π°ΡΠ΄Π½ΠΈΡ
ΠΎΠΏΡΠ΅ΡΠ²Π°ΡΠΈΡΠ°.The subject of this doctoral dissertation is the development of the methodology
for detecting multivariate outliers through the modification of the IvanoviΔ (I-distance)
distance method.
Detecting outliers in the k-dimensional space is as important as detecting them in
a single dimension. The term outlier refers to the observation which is in some way
inconsistent with the rest of the observations in a data set. Multivariate outliers are most
commonly detected using the Mahalanobis distance method.
I-distance is used to measure the intensity of an occurrence, using a number of
selected indicators. An improved method of I-distance tests the significance of each of
the observed indicators using the appropriate F statistics. Through defined procedures for
the elimination and /or selection of indicators, the new method seeks to form an optimal
set of indicators, while reducing the dimension of the complex problem at hand.
The stepwise I-distance method takes into account the discriminatory power of
each of the indicators used. Accordingly, a unique I-distance value is formed for each
observation from the observed set. The research results show that this method can be used
to detect multivariate outliers