title: Mice package in a time-series analysis
body: <pre><code> newdata &lt;- mice(data = newdata, m = 5, method = "pmm", seed = 500)
  
  iter imp variable
    1   1  1996-01-31Error in terms.formula(tmp, simplify = TRUE) : 
    invalid model formula in ExtractVars
  </code></pre>