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प्रश्न
Define Time series
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उत्तर
A Time-Series consists of data arranged chronologically – Croxton and Cowden
When quantitative data are arranged in the order of their occurrence, the resulting series is called the Time Series – Wessel and Wallet.
A time series consists of a set of observations arranged in chronological order (either ascending or descending).
Times Series has an important objective to identify the variations and try to eliminate the variations and also helps us to estimate or predict the future values.
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संबंधित प्रश्न
What is the need for studying time series?
Define seasonal index
Determine the equation of a straight line which best fits the following data
| Year | 2000 | 2001 | 2002 | 2003 | 2004 |
| Sales (₹ '000) | 35 | 36 | 79 | 80 | 40 |
Compute the trend values for all years from 2000 to 2004
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
Choose the correct alternative:
A time series consists of
Choose the correct alternative:
The value of ‘b’ in the trend line y = a + bx is
Fit a straight line trend by the method of least squares to the following data
| Year | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 |
| Sales | 50.3 | 52.7 | 49.3 | 57.3 | 56.8 | 60.7 | 62.1 | 58.7 |
A bullet of mass m and velocity a is fired into a large block of wood of mass M The final velocity of the system is
Let An be the sum of the first n terms of the geometric series `704 + 704/2 + 704/4 + 704/8 + ...` and Bn be the sum of the first n terms of the geometric series `1984 - 1984/2 + 1984/4 + 1984/8 + ...` If An = Bn, then the value ofn is (where n ∈ N).
The sum of the series 3.6 + 4.7 + 5.8 + ....... upto (n – 2) terms
