##  [1] "date"       "permits"    "ans"        "starts"     "underc"    
##  [6] "compl"      "GDP"        "permast"    "permst"     "permcomp"  
## [11] "permcont"   "authcomp"   "startconst" "constcomp"  "yystart"   
## [16] "yyunderc"   "yypermits"  "salall"     "salspec"    "salcomp"   
## [21] "salconst"   "avgsal"     "medsal"     "davgmed"    "percd"     
## [26] "salsk"      "sd"         "PI"         "DSPI"       "PCE"       
## [31] "PCEPI"      "PT"         "FREDS"      "mPI"        "mDSPI"     
## [36] "mPCE"       "mS"         "S"          "mSR"        "mSN"       
## [41] "SN"         "mSE"        "mPT"        "mGDP"       "mTR"       
## [46] "spn"        "year"       "month"      "yyS"        "yyDSPI"    
## [51] "yyPT"       "yyGDP"      "tsal"       "yytsal"     "yyavgsal"  
## [56] "yymedsal"   "yysalall"   "yysalspec"  "yystarts"   "yycompl"   
## [61] "yyans"      "yysalconst"