Question

Suppose that the true distribution function F(x) and the fitted distribution function of  are the same. For...

Suppose that the true distribution function F(x) and the fitted distribution function of  are the same. For what distribution F(x) will the Q-Q and P-P plots be essentially the same if the sample size n is large?

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Answer:

For normal distribution F(x) will be the Q-Q and P-P plots be essentially same if the sample size is large.

Reason:

The probability-probability plot is a graph of the empirical CDF values plotted against the theoretical (fitted) CDF values. It is used to determine how well a specific distribution fits to the observed data. The P-P plot will be approximately linear if the specified theoretical distribution is the correct model.

The quantile-quantile plot is a graph of the input data values plotted against the quantiles (inverse CDF values) of the fitted distribution.

The interpretation of the Q-Q plot is similar to the P-P plot: if the distribution you are testing is the correct model, the graph points will lie on an approximately straight line.

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