DRAINAGE RESEARCH IN FARMERS' FIELDS: ANALYSIS OF DATA

R.J. Oosterbaan, July 2002

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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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