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Flashcards in Analytic Techniques Deck (110)
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91

what does d mean in time series (ARMA, ARIMA)?

the number of differences

92

what does q mean in time series (ARMA, ARIMA)?

the number of moving average terms

93

in time series, what does ACF mean?

auto correlation function

94

what is ACF?

provides indication of the stationarity of the data

95

in time series, what does PACF mean?

partial auto correlation function

96

what is PACF?

autocorrelation calculated after removing the linear dependence of the previous terms

97

what is text analysis?

processing of text

98

why is text analysis high-dimensional?

every word is a dimension

99

what are the three problem solving tasks in text analysis?

parsing
search/retrieval
text-mining

100

what is parsing in text analysis?

imposing structure

101

what is search/retrieval in text analysis?

searching for word or phrase

102

what is a corpus?

body of knowledge

103

what is text-mining in text analysis?

understanding the content

104

what is regex (regular expressions) in text analysis?

used for finding words, strings or patterns in text

105

what is bag of words in text analysis?

term frequency (tf)

106

what is reverse index in text analysis?

a list of all the documents that contain that feature

107

what is IDF in text analysis?

inverse document frequency

108

what are the metrics in text analysis that determine the quality of results?
a)recall, relevance, confidence
b)relevance, precision, recall
c)relevance, lift, recall

b)relevance, precision, recall

109

what does IDF do?

measles the uniqueness of a term in the corpus

110

what does tf-idf mean?

measure of relevance