Model:LOADEST: Difference between revisions
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|Type of contact=Technical contact | |Type of contact=Technical contact | ||
|Institute / Organization=U.S. Geological Survey | |Institute / Organization=U.S. Geological Survey | ||
|Postal address 1=Denver Federal Center | |Postal address 1=Denver Federal Center | ||
|Town / City=Lakewood | |Town / City=Lakewood | ||
|Postal code=80225 | |Postal code=80225 | ||
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|Model type=Single | |Model type=Single | ||
|Categories=Coastal, Terrestrial | |Categories=Coastal, Terrestrial | ||
|One-line model description=Software for estimating constituent loads in streams and rivers | |One-line model description=Software for estimating constituent loads in streams and rivers | ||
|Extended model description=LOAD ESTimator (LOADEST) is a FORTRAN program for estimating constituent loads in streams and rivers. Given a time series of streamflow, additional data variables, and constituent concentration, LOADEST assists the user in developing a regression model for the estimation of constituent load (calibration). Explanatory variables within the regression model include various functions of streamflow, decimal time, and additional user-specified data variables. The formulated regression model then is used to estimate loads over a user-specified time interval (estimation). Mean load estimates, standard errors, and 95 percent confidence intervals are developed on a monthly and(or) seasonal basis. | |Extended model description=LOAD ESTimator (LOADEST) is a FORTRAN program for estimating constituent loads in streams and rivers. Given a time series of streamflow, additional data variables, and constituent concentration, LOADEST assists the user in developing a regression model for the estimation of constituent load (calibration). Explanatory variables within the regression model include various functions of streamflow, decimal time, and additional user-specified data variables. The formulated regression model then is used to estimate loads over a user-specified time interval (estimation). Mean load estimates, standard errors, and 95 percent confidence intervals are developed on a monthly and(or) seasonal basis. | ||
The calibration and estimation procedures within LOADEST are based on three statistical estimation methods. The first two methods, Adjusted Maximum Likelihood Estimation (AMLE) and Maximum Likelihood Estimation (MLE), are appropriate when the calibration model errors (residuals) are normally distributed. Of the two, AMLE is the method of choice when the calibration data set (time series of streamflow, additional data variables, and concentration) contains censored data. The third method, Least Absolute Deviation (LAD), is an alternative to maximum likelihood estimation when the residuals are not normally distributed. LOADEST output includes diagnostic tests and warnings to assist the user in determining the appropriate estimation method and in interpreting the estimated loads. | The calibration and estimation procedures within LOADEST are based on three statistical estimation methods. The first two methods, Adjusted Maximum Likelihood Estimation (AMLE) and Maximum Likelihood Estimation (MLE), are appropriate when the calibration model errors (residuals) are normally distributed. Of the two, AMLE is the method of choice when the calibration data set (time series of streamflow, additional data variables, and concentration) contains censored data. The third method, Least Absolute Deviation (LAD), is an alternative to maximum likelihood estimation when the residuals are not normally distributed. LOADEST output includes diagnostic tests and warnings to assist the user in determining the appropriate estimation method and in interpreting the estimated loads. | ||
The LOADEST software and related materials (data and documentation) are made available by the U.S. Geological Survey (USGS) to be used in the public interest and the advancement of science. You may, without any fee or cost, use, copy, modify, or distribute this software, and any derivative works thereof, and its supporting documentation, subject to the USGS software User's Rights Notice. | The LOADEST software and related materials (data and documentation) are made available by the U.S. Geological Survey (USGS) to be used in the public interest and the advancement of science. You may, without any fee or cost, use, copy, modify, or distribute this software, and any derivative works thereof, and its supporting documentation, subject to the USGS software User's Rights Notice. | ||
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{{Model technical information | {{Model technical information | ||
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|Does model development still take place?=No | |Does model development still take place?=No | ||
|End year development=2005 | |End year development=2005 | ||
|Model availability=As code | |Model availability=As code | ||
|Source code availability=Through | |Source code availability=Through web repository | ||
|Source web address=http://water.usgs.gov/software/loadest/ | |||
|Program license type=Other | |Program license type=Other | ||
|Program license type other=U.S. Government software product | |Program license type other=U.S. Government software product | ||
|OpenMI compliant=No but possible | |OpenMI compliant=No but possible | ||
|CCA component=No but possible | |CCA component=No but possible | ||
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}} | }} | ||
{{Input - Output description | {{Input - Output description | ||
|Describe input parameters=Given a time series of streamflow, additional data variables, and constituent concentration, LOADEST assists the user in developing a regression model for the estimation of constituent load (calibration). | |Describe input parameters=Given a time series of streamflow, additional data variables, and constituent concentration, LOADEST assists the user in developing a regression model for the estimation of constituent load (calibration). | ||
|Input format=ASCII | |Input format=ASCII | ||
|Describe output parameters=Estimated constituent loads | |Describe output parameters=Estimated constituent loads | ||
|Output format=ASCII | |Output format=ASCII | ||
|Pre-processing software needed?=No | |Pre-processing software needed?=No | ||
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{{Model testing | {{Model testing | ||
|Describe available calibration data sets=-- | |Describe available calibration data sets=-- | ||
|Describe available test data sets=See applications described in software documentation http://water.usgs.gov/software/loadest/doc/ | |Describe available test data sets=See applications described in software documentation http://water.usgs.gov/software/loadest/doc/ | ||
|Describe ideal data for testing=-- | |Describe ideal data for testing=-- | ||
}} | }} | ||
Revision as of 12:15, 28 April 2010
Contact
| Name | Rob Runkel |
| Type of contact | Technical contact |
| Institute / Organization | U.S. Geological Survey |
| Postal address 1 | Denver Federal Center |
| Postal address 2 | |
| Town / City | Lakewood |
| Postal code | 80225 |
| State | Colorado |
| Country | USA"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country" property. |
| Email address | runkel@usgs.gov |
| Phone | 303/236-4882 ext. 285 |
| Fax | 303/236-4912 |
LOADEST
Metadata
Summary
Technical specs
In/Output
Process
Testing
Other
IntroductionHistoryPapersIssuesHelpInput FilesOutput FilesDownloadSource |
