Regional studies in hydrology are performed: (Select all that apply)

To obtain estimates at locations with no gage, When gage data is too short or insufficient, To develop a single set of parameter estimates to use throughout a region

Which of the following is typ. considered when defining homogeneous regions for RFA? (Select all that apply)

Climate divisions, Elevation, Meteorologic similarity

Uncertainty in frequency estimates tends to decrease with

An increase in sample size (record length)

Compared to traditional product moments, L-moments are preferred in regional frequency analysis because they:

Provide more robust estimates, especially from smaller datasets

The Poisson distribution is used to model what aspect of an extreme value analysis?

The count of events exceeding a threshold in a year

In estimation theory, a sampling distribution describes

the uncertainty in estimating the probability dist param from a sample

The greatest source of uncertainty in a flow-frequency curve is:

Sample of streamflow obs might not be representative of the population

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Stats Class 2025 Day 3 Review

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Review of: -Uncertainty in Frequency Estimates -Extreme Value Theory -Peaks Over Threshold -Regional Precipitation Frequency Analysis

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Questions 14

Answers

1
The experiment involving the synthetic 1000-year sample was an example of
Monte Carlo simulation
Prediction of the future
Mixed population analysis
Bayesian statistics
2
Which of the following factors might make a GEV distribution a poor model for a sample of annual maximum data?
Parent distribution for the data is not homogeneous
Too few independent events per year
All of the above
Too few years of data
3
Uncertainty in plotting positions can be modeled with the _____ distribution.
Generalized Pareto
Beta
Normal
GEV
4
Which of the following probability distributions is NOT one of the cases of the GEV distribution?
Pareto
Weibull
Gumbel
Fréchet
5
Which analytical probability distribution should be fit to a partial duration series?
Log Pearson type 3
Generalized Extreme Value type 1
Generalized Pareto
Generalized Extreme Value type 2
6
Regional studies in hydrology are performed: (Select all that apply)
To obtain estimates at locations with no gage
Because they are easier than at-site analyses
When gage data is too short or insufficient
To develop a single set of parameter estimates to use throughout a region
7
Which of the following is typ. considered when defining homogeneous regions for RFA? (Select all that apply)
County or state boundaries
Climate divisions
Elevation
Meteorologic similarity
8
Uncertainty in frequency estimates tends to decrease with
The number of analysts estimating the frequency curve
A decrease in sample size (record length)
An increase in sample size (record length)
The number of dice we use in the estimate
9
Compared to traditional product moments, L-moments are preferred in regional frequency analysis because they:
Are highly sensitive to outliers
Are less skewed
Provide more robust estimates, especially from smaller datasets
Eliminate the need to select a probability distribution
10
The Poisson distribution is used to model what aspect of an extreme value analysis?
The magnitude of events below a threshold
The count of events exceeding a threshold in a year
The count of events below a threshold in a year
The magnitude of events exceeding a threshold
11
In estimation theory, a sampling distribution describes
an application of the Central Limit Theorem
how uniformly the streamflow gages are distributed around a region
the uncertainty in estimating the probability dist param from a sample
the people that were asked who they intend to vote for in the next election
12
The greatest source of uncertainty in a flow-frequency curve is:
Sample of streamflow obs might not be representative of the population
It is difficult to estimate streamflow from measured stage
A streamflow gage is sometimes moved to another location
Streamflow is difficult to measure when velocity is high
13
Which partial duration series filtering criteria is the most important?
Time separation
Magnitude differential
Threshold value
Drainage area
14
Annual (or other kinds of block maxima) converge to the ____ distribution?
Generalized Pareto
Beta
Normal
GEV

Stats Class 2025 Day 3 Review Flashcards | StudBud