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प्रश्न
Define secular trend
उत्तर
It is a general tendency of time series to increase or decrease or stagnates during a long period of time, an upward tendency is usually observed in population of a country, production, sales, prices in industries, income or individuals etc.
A downward tendency is observed in deaths, epidemics, prices of electronic gadgets, water sources, mortality rate etc.
It is not necessarily that the increase or decrease should be in the same direction throughout the given period of time.
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संबंधित प्रश्न
Write a brief note on seasonal variations
Explain the method of fitting a straight line
State the two normal equations used in fitting a straight line
State the different methods of measuring trend
Calculate the seasonal indices from the following data using the average method:
| Year | I Quarter | II Quarter | III Quarter | IV Quarter |
| 2008 | 72 | 68 | 62 | 76 |
| 2009 | 78 | 74 | 78 | 72 |
| 2010 | 74 | 70 | 72 | 76 |
| 2011 | 76 | 74 | 74 | 72 |
| 2012 | 72 | 72 | 76 | 68 |
The following table shows the number of salesmen working for a certain concern:
| Year | 1992 | 1993 | 1994 | 1995 | 1996 |
| No. of salesman |
46 | 48 | 42 | 56 | 52 |
Use the method of least squares to fit a straight line and estimate the number of salesmen in 1997
Choose the correct alternative:
The additive model of the time series with the components T, S, C and I is
Choose the correct alternative:
The seasonal variation means the variations occurring with in
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
Sum of n terms of series 1.3 + 3.5 + 5.7 + ______ is
