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प्रश्न
Write a brief note on seasonal variations
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उत्तर
Seasonal Variations: As the name suggests, tendency movements are due to nature which repeat themselves periodically in every seasons.
These variations repeat themselves in less than one year time.
It is measured in an interval of time.
Seasonal variations may be influenced by natural force, social customs and traditions.
These variations are the results of such factors which uniformly and regularly rise and fall in the magnitude.
For example, selling of umbrellas’ and raincoat in the rainy season, sales of cool drinks in summer season, crackers in deepawali season, purchase of dresses in a festival season, sugarcane in Pongal season.
APPEARS IN
संबंधित प्रश्न
Define Time series
State the different methods of measuring trend
The annual production of a commodity is given as follows:
| Year | production (in tones) |
| 1995 | 155 |
| 1996 | 162 |
| 1997 | 171 |
| 19988 | 182 |
| 1999 | 158 |
| 2000 | 880 |
| 2001 | 178 |
Fit a straight line trend by the method of least squares
The sales of a commodity in tones varied from January 2010 to December 2010 as follows:
| In Year 2010 | Sales (in tones) |
| Jan | 280 |
| Feb | 240 |
| Mar | 270 |
| Apr | 300 |
| May | 280 |
| Jun | 290 |
| Jul | 210 |
| Aug | 200 |
| Sep | 230 |
| Oct | 200 |
| Nov | 230 |
| Dec | 210 |
Fit a trend line by the method of semi-average
Use the method of monthly averages to find the monthly indices for the following data of production of a commodity for the years 2002, 2003 and 2004
| 2002 | 2003 | 2004 |
| 15 | 20 | 18 |
| 18 | 18 | 25 |
| 17 | 16 | 21 |
| 19 | 13 | 11 |
| 16 | 12 | 14 |
| 20 | 15 | 16 |
| 21 | 22 | 19 |
| 18 | 16 | 20 |
| 17 | 18 | 1 |
| 15 | 20 | 16 |
| 14 | 17 | 18 |
| 18 | 15 | 20 |
Choose the correct alternative:
The components of a time series which is attached to short term fluctuation is
Choose the correct alternative:
The additive model of the time series with the components T, S, C and I is
Choose the correct alternative:
Least square method of fitting a trend is
The sum of the series `log_4 2 - log_8 2 + log_16 2 + ...............` to `oo` is
What is the sum of the first 50 terms of the series (1 × 3) + (3 × 5) + (5 × 7) + ...?
