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Time filtering technique is used to remove or to retain
variations at
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particular bands of frequencies from the time series.
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There are three types of filtering:
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(1) High-Pass Filtering
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keep
high-frequency parts of the variations and remove low-
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frequency parts of the variations.
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(2) Low-Pass Filtering
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keep
low-frequency and remove high-frequency parts of the
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variations.
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(3) Band-Pass Filtering
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remove both
higher and lower frequencies and keep only certain
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frequency bands of the variations.
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