Time series analysis
Correlation, regression and applied statistics · Mathematics
Study notes
Q: Quarterly ice-cream sales: Q1=80, Q2=140, Q3=150, Q4=90 (₹000). Identify components. Yearly total 460. Q2-Q3 high, Q1-Q4 low: strong SEASONAL pattern (summer!). Underlying growth across years would be TREND. A one-time heatwave spike: IRREGULAR.