title: Computing Frequencies Across Multiple Variables SPSS
body: <p>I am working on a clinical research project using a large dataset of nationwide hospital discharges. We are using SPSS for statistical analysis.</p>
  
  <p>The dataset contains 25 diagnoses variables (DX1-DX25) which capture up to 25 diagnoses per discharge. A patient could have multiple diagnoses, so DX1 would be the primary diagnosis, DX2 is the secondary, etc. </p>
  
  <p>The DXn variables are string variables that contain ICD-9 codes. ICD-9 is a system of diagnostic codes for classifying diseases.</p>
  
  <p>We would like to know the 10 most common diagnoses (ICD-9 codes) across all 25 diagnoses variables. Is there a way to run a frequency analysis across all 25 diagnoses variables in SPSS? In other words, I would like one frequency table that shows the combined frequency/occurrence of each ICD-9 code.</p>
  
  <p>Thanks!</p>