Welcome to class of Data Analysis -Dr. Satyendra Singh

Data Management incomplete or Unusable Data coding editing Data & Cleaning data Entry data Transformations documenting

Handling Incomplete or Unusable Data discard go back to respondent use data as they are

Coding closed / open questions who develops the codes when to develop codes recoding how to code preparing the codebook coder reliability

Editing Data / Cleaning Field Edit –field procedure –supervision Office edit –incomplete (no impulse) –incorrect (manipulation check) –no interest (reverse coded)

Cleaning Pre-editing of computer entries –out of range –logic checks Post-editing –expenditure –brands / outlets

Data Entry Use of data screens Validation Converting to computer file

Data Transformations recoding variables rescaling variables combining variables

Documenting the Data Set Contents –variable labels –value labels –missing values –marginals Mode –paper –computer file