R Lesson 3: Double Exponential Smoothing

Assalamualaikum, kali ini saya akan tunjukkan bagaimana untuk generate forecast values using Double Exponential Smoothing aka Brown Exponential Smoothing (DES).
Data: Consumer Price Index (CPI-1994)

Step 1 to 3 refer to my previous post
Step 4: (Perform DES with a=0.75, initial=31.3)
Step 5: Generate Forecast values
Step 6: Error measures




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