If you have monthly data over a number of years, how many dummy variables will you introduce

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If you have monthly data over a number of years, how many dummy variables will you introduce to test the following hypotheses:
a. All the 12 months of the year exhibit seasonal patterns.
b. Only February, April, June, August, October, and December exhibit seasonal patterns.

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Basic Econometrics

ISBN: 978-0073375779

5th edition

Authors: Damodar N. Gujrati, Dawn C. Porter

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