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प्रश्न
State the two normal equations used in fitting a straight line
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उत्तर
The constants ‘a’ and ‘b’ are estimated by solving the following two normal Equations
`sum"Y"` = na + `"b"sum"X"` .........(2)
`sum"XY" = "a"sum"X" + "b"sum"X"^2` .........(3)
Where ‘n’ = Number of years given in the data.
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संबंधित प्रश्न
State the uses of time series
Explain cyclic variations
Discuss about irregular variation
Explain the method of fitting a straight line
The following table gives the number of small-scale units registered with the Directorate of Industries between 1985 and 1991. Show the growth on a trend line by the free hand method.
| Year | No. of units (in '000) |
| 195 | 10 |
| 986 | 22 |
| 1987 | 36 |
| 198 | 62 |
| 1989 | 55 |
| 1990 | 0 |
| 1991 | 34 |
| 1992 | 50 |
Choose the correct alternative:
A time series consists of
Choose the correct alternative:
The component of a time series attached to long term variation is trended as
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The sum of the infinite series `x + (1 + 2)/(2!) x^2 + (1 + 2 + 3)/(3!) x^3 +` .... equals
The sum of the series `log_4 2 - log_8 2 + log_16 2 + ...............` to `oo` is
