title: seas start year error R
body: <p>I am currently trying to deseasonalize data for ARIMA models using the U.S. Census Bureau's package seasonal
  <code>install.packages("seasonal")</code></p>
  
  <p>you can find a modified version of the <a href="https://slapadabias.wordpress.com/2015/05/20/deseasonlizeable/" rel="nofollow">data set here</a>.</p>
  
  <p>also there is a <a href="http://cran.r-project.org/web/packages/seasonal/vignettes/seas.pdf" rel="nofollow">vignette of the package here</a> which gives very straight-forward directions as to how to install and specify X-13 so the seas command will run.</p>
  
  <p>I've made sure that I installed X-13 properly, and indeed the program tells me "'seasonal' should work fine!" I've made sure the data is converted to the right format, but when I call the function I get an error.</p>
  
  <p>The first observation in the time series is july first 1981, and the final being October first 2010. </p>
  
  <p><code>season0&lt;-as.ts(seasonal,start=c(1981,7),end=c(2010,10),frequency=4,class='mts')</code></p>
  
  <p>which converts the earliest observation in the set to the number 4199. however, when I call the function
  <code>seas(season0)</code> it spits out
  <code>Error in seas(season0) : start year of 'x' must be &gt; 999.</code></p>
  
  <p>I don't understand why this is the case since I checked that my installation was right and that may start year is way bigger than 999.</p>
  
  <p>Any help would be greatly appreciated :)</p>