Fractional integration analysis of precipitation dynamics: empirical insights from Nigeria

O.O. Awe; L.A. Gil-Alana

doi:10.1080/16000870.2020.1822099

Fractional integration analysis of precipitation dynamics: empirical insights from Nigeria

Tellus

Volume 73 (2021): Issue 1

By: O.O. Awe and L.A. Gil-Alana

Open Access

|Jan 2021

Figures & Tables

Map of Nigeria. *Source*: pinterest.com.

Rainfall data (mm) and estimated trends.

Table 1.

Estimates of d (and 95% bands) in the model given by Eq. (1).

CityNo deterministic terms (α = β = 0)An intercept (β = 0)A linear trendKano0.25 (0.08, 0.44)0.19 (0.05, 0.39)0.19 (0.04, 0.39)Kaduna0.08 (0.02, 0.23)0.11 (0.01, 0.27)0.08 (−0.03, 0.24)Ibadan−0.05 (−0.12, 0.17)−0.05 (−0.17, 0.13)−0.05 (−0.17, 0.13)Lagos−0.02 (−0.08, 0.11)−0.04 (−0.17, 0.16)−0.10 (−0.25, 0.12)

[i] The values in parenthesis refer to the 95% confidence interval of the non-rejection values of d. In bold, the selected model according to the deterministic terms.

Table 2.

Estimated coefficients for the selected models in Table 1.

Cityd (95% band)InterceptTime trendSeasonalityKano0.19 (0.05, 0.39)99.952 (3.86)xxx0.750Kaduna0.11 (0.01, 0.27)101.091 (6.75)xxx0.827Ibadan−0.05 (−0.17, 0.13)118.731 (18.81)xxx0.645Lagos−0.10 (−0.25, 0.12)113.180 (8.89)0.233 (1.72)0.587

[i] The values in parenthesis in the third and fourth columns are the corresponding t-values.

Table 3.

Annual temperature, latitude and longitude of the studied regions.

CityAverage Annual Temperature RangeLatitude/LongitudeLagos50 °F to 79 °F6.5244°N/3.3792°EKano53 °F to 102 °F12.0022°N/ 8.5920°EIbadan69 °F to 92 °F7.3775°N/3.9470°EKaduna55 °F to 95 °F10.5105° N/7.4165°E

[i] Source: (www.nimet.gov.ng).

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DOI: https://doi.org/10.1080/16000870.2020.1822099 | Journal eISSN: 3035-9554

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Language: English

Page range: 1822099 - 1822099

Published on: Jan 1, 2021

Published by: Stockholm University Press

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