Time Series analysis was used to examine adolescent mood changes-pattern over an eight week period. This method was used to empirically determine different change profiles among adolescents of the Igbo families in the South East-Nigeria, and to describe how their change pattern differ with respect to their marketing or non marketing vocation.
The result showed that the marketing participants seemed to start high in cheerfulness in the morning, drop lower to irritability in the afternoon which continues to evening and back to cheerfulness in the night. The non-marketing participants start high in irritability in the morning; drop lower in irritability in the afternoon and show cheerfulness at night. Significant difference exists between the two groups on Saturdays when the non-marketers are cheerful almost all through the day. These patterns of irritability indicate that fluctuations in mood change may be related to natural and occupationally determined rhythm.