A team of researchers is given a large data set consisting of time series of average...
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A team of researchers is given a large data set consisting of time series of average monthly temperatures at a million points on the surface of the globe over 20 years. The columns correspond to months, and each row is a time series. The research team analyzes this data using correlation, L1 distance, and Euclidean distance to compare the time series and find which time series are similar to one another. Specifically, they compute the correlation/distance of each time series with every other time series. However, after visualizing some time series in the data set, the team discovers that the columns (the months) in each year of the original data are out of order, i.e., instead of (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov Dec) the order is (Jan, Jul, Feb, Aug, Mar, Sep, Apr, Oct, May, Nov, Jun, Dec). Rows are in proper order. a) What property of temperature time series data would make it obvious that the months were not in proper order when the time series were plotted? b) The team member who performed the correlation/distance calculations submits a job with the properly ordered months to recalculate the correlations/distances, but after doing so realizes that this was unnecessary. Why? A team of researchers is given a large data set consisting of time series of average monthly temperatures at a million points on the surface of the globe over 20 years. The columns correspond to months, and each row is a time series. The research team analyzes this data using correlation, L1 distance, and Euclidean distance to compare the time series and find which time series are similar to one another. Specifically, they compute the correlation/distance of each time series with every other time series. However, after visualizing some time series in the data set, the team discovers that the columns (the months) in each year of the original data are out of order, i.e., instead of (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov Dec) the order is (Jan, Jul, Feb, Aug, Mar, Sep, Apr, Oct, May, Nov, Jun, Dec). Rows are in proper order. a) What property of temperature time series data would make it obvious that the months were not in proper order when the time series were plotted? b) The team member who performed the correlation/distance calculations submits a job with the properly ordered months to recalculate the correlations/distances, but after doing so realizes that this was unnecessary. Why?
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Answer rating: 100% (QA)
a Just by looking at the values a person can tell that the data points are not order... View the full answer
Related Book For
Engineering Economy
ISBN: 978-0132554909
15th edition
Authors: William G. Sullivan, Elin M. Wicks, C. Patrick Koelling
Posted Date:
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