DRAINAGE RESEARCH IN FARMERS' FIELDS: ANALYSIS OF DATA
 
R.J. Oosterbaan, July 2002
 
On web site www.waterlog.info
 
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DRAINAGE RESEARCH IN FARMERS' FIELDS: ANALYSIS OF DATA
 
TABLE OF CONTENTS
 
 
1. Analysis of data
    1.1 Types of analysis
    1.2 Parameters
 
2. Standard statistical analysis
    2.1 Frequency analysis
           Means and standard deviations
           Cumulative frequencies of crop yield
           Cumulative frequencies of water-table depth
           Cumulative frequencies of soil salinity
           Cumulative and interval frequencies of hydraulic conductivity
           Cumulative frequencies of rainfall
           Cumulative frequencies of river discharge
           Cumulative frequencies of drain discharge
           Missing data
           Outliers
    2.2 Time-series analysis
           Time series (hydrograph) of drain discharge
           Time series (hydrograph) of water-table depth
           Frequency distribution in two sub-periods and mass method
    2.3 Testing of differences
    2.4 Spatial differences
    2.5 Correlation analysis
 
3. Conceptual statistical analysis
    3.1 Linear regression, ratio method
    3.2 Linear regression, least squares method
           Linear relation between drain discharge and level of the water table
           Non-linear relation between drain discharge and water table
           Linear relation between crop production and depth of water table
    3.3 Intermediate regression
    3.4 Segmented two-variable linear regression
           Non-linear relation between water level and time
           Non-linear relation between crop production and soil salinity
           Non-linear relation between crop production and irrigation
           Non-linear relation between crop production water table
    3.5 Segmented three-variable linear regression

 
4. Conceptual deterministic analysis
    4.1 Introduction
    4.2 Transient recharge-discharge relations
 
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