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 References |
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