ISS (Statistical Services) Statistics Paper III: Questions 38 - 42 of 96

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Question number: 38

» Econometrics » Ordinary Least Squares (OLS)

Appeared in Year: 2011

Essay Question▾

Describe in Detail

If Equation is an individual’s utility function of two goods, show that the demand for the goods is Equation and Equation

WhereEquation and Equation are the fixed price and µ be the individual fixed income.

Explanation

For consumer’s equilibrium, we have

Equation

Equation and hence, we get

Equation

Equation

Equation

Equation

Equation

Equation

Equation ………………. (i)

since, µ the individual income is fixed, we have

Equation

Equation

Equation

Substituting the value of Equation in (i),

… (5 more words) …

Question number: 39

» Econometrics » Auto-Correlation

Appeared in Year: 2011

Essay Question▾

Describe in Detail

Discuss the effect of imperfect multicollinearity on tests and errors. Consider a model

Equation with

Equation and Equation with

Equation , Equation , Equation

and Equation

Do you think multicollinearity is present in the model? If yes, give reasons. Further show that as

Equation increases, Equation also increases.

Explanation

Effect of imperfect multicollinearity on tests and errors:

  1. OLS estimators will be BLUE, but they have large variances and covariances. this makes the estimation difficult.

  2. The confidence intervals will be wider. and hence, we may not reject the ’zero null hypothesis i. e. , We may conclude that B’s are

… (163 more words) …

Question number: 40

» Applied Statistics » Time Series Analysis » Exponential and Moving Average Smoothing

Appeared in Year: 2011

Essay Question▾

Describe in Detail

Explain moving average [m, p]. Let Equation with p = 1 and m = 2k + 1, obtain the coefficient Equation of Equation and [m, p]

Explanation

Moving average: moving average method is a simple and flexible method for measuring trend. It consists in measurement of trend by smoothing out the fluctuations of the data by means of a moving average.

The first element of the moving average is obtained by taking the average of the initial

… (285 more words) …

Question number: 41

» Applied Statistics » Index Numbers » Price Relatives and Quantity or Volume Relatives

Appeared in Year: 2010

Short Answer Question▾

Write in Short

Discuss briefly the steps involved in the construction of cost of living index number.

Question number: 42

» Applied Statistics » Time Series Analysis » Economic Time Series & Components

Appeared in Year: 2010

Short Answer Question▾

Write in Short

Discuss the ratio to trend method for separating the seasonal component in a time series.

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