Hi All,
I run a panel data fixed effect regression. The unit is each agency in each month. Some areas have one agency, but some areas have multiple agencies. From the results, I got the coefficients for the dummy and the interaction term. It's fine that tip length is omitted since it's yearly level characteristic. However, when I try to get the marginal effect using the "margins" command, it returns "not estimable".
What should I do then? What's the problem here?
Thanks!
Best,
Katie&Linda
I run a panel data fixed effect regression. The unit is each agency in each month. Some areas have one agency, but some areas have multiple agencies. From the results, I got the coefficients for the dummy and the interaction term. It's fine that tip length is omitted since it's yearly level characteristic. However, when I try to get the marginal effect using the "margins" command, it returns "not estimable".
What should I do then? What's the problem here?
Thanks!
Best,
Katie&Linda
Code:
. xtset Agency_id Year_Month panel variable: Agency_id (strongly balanced) time variable: Year_Month, 1 to 202 delta: 1 unit . xtreg lnUPT i.Uber_Dummy##c.ln_trip_length_yearly i.Year i.Month i.Area_id, fe r note: ln_trip_length_yearly omitted because of collinearity note: 2.Area_id omitted because of collinearity note: 3.Area_id omitted because of collinearity note: 4.Area_id omitted because of collinearity note: 5.Area_id omitted because of collinearity note: 7.Area_id omitted because of collinearity note: 8.Area_id omitted because of collinearity note: 9.Area_id omitted because of collinearity note: 10.Area_id omitted because of collinearity note: 11.Area_id omitted because of collinearity note: 12.Area_id omitted because of collinearity note: 13.Area_id omitted because of collinearity note: 14.Area_id omitted because of collinearity note: 15.Area_id omitted because of collinearity note: 16.Area_id omitted because of collinearity note: 17.Area_id omitted because of collinearity 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Err. adjusted for 577 clusters in Agency_id) ---------------------------------------------------------------------------------------------------- | Robust lnUPT | Coef. Std. Err. t P>|t| [95% Conf. Interval] -----------------------------------+---------------------------------------------------------------- 1.Uber_Dummy | -.3005539 .5226027 -0.58 0.565 -1.326993 .7258853 ln_trip_length_yearly | 0 (omitted) | Uber_Dummy#c.ln_trip_length_yearly | 1 | .0230477 .22767 0.10 0.919 -.4241168 .4702123 | Year | 2003 | .4708216 .1319299 3.57 0.000 .2116993 .7299439 2004 | .720751 .166671 4.32 0.000 .3933939 1.048108 2005 | 1.076519 .1879828 5.73 0.000 .7073037 1.445735 2006 | 1.938873 .2076607 9.34 0.000 1.531009 2.346738 2007 | 2.481783 .2111151 11.76 0.000 2.067133 2.896432 2008 | 2.602228 .2178941 11.94 0.000 2.174264 3.030192 2009 | 2.884311 .2250661 12.82 0.000 2.44226 3.326361 2010 | 3.00545 .230801 13.02 0.000 2.552136 3.458764 2011 | 3.158327 .2329556 13.56 0.000 2.700781 3.615873 2012 | 3.276523 .2444711 13.40 0.000 2.79636 3.756687 2013 | 3.427571 .2507565 13.67 0.000 2.935063 3.92008 2014 | 3.562416 .2680084 13.29 0.000 3.036023 4.088809 2015 | 3.800382 .2914877 13.04 0.000 3.227874 4.372891 2016 | 3.877549 .2986688 12.98 0.000 3.290936 4.464162 2017 | 3.816025 .3085689 12.37 0.000 3.209967 4.422082 2018 | 3.473521 .3120829 11.13 0.000 2.860561 4.08648 | Month | 2 | -.0043397 .0048579 -0.89 0.372 -.0138811 .0052016 3 | .0641212 .0061542 10.42 0.000 .0520337 .0762086 4 | .0347302 .0091859 3.78 0.000 .0166883 .0527721 5 | .0007595 .013127 0.06 0.954 -.0250232 .0265422 6 | -.0567995 .0191928 -2.96 0.003 -.0944959 -.0191031 7 | -.0876537 .0226005 -3.88 0.000 -.1320432 -.0432642 8 | -.0048561 .0197063 -0.25 0.805 -.0435611 .0338488 9 | .0063827 .0194414 0.33 0.743 -.031802 .0445674 10 | -.0732883 .0222099 -3.30 0.001 -.1169106 -.0296659 11 | -.092751 .0217057 -4.27 0.000 -.1353829 -.0501191 12 | -.1584272 .0236513 -6.70 0.000 -.2048806 -.1119739 | Area_id | 2 | 0 (omitted) 3 | 0 (omitted) 4 | 0 (omitted) 5 | 0 (omitted) 7 | 0 (omitted) 8 | 0 (omitted) 9 | 0 (omitted) 10 | 0 (omitted) 11 | 0 (omitted) 12 | 0 (omitted) 13 | 0 (omitted) 14 | 0 (omitted) 15 | 0 (omitted) 16 | 0 (omitted) 17 | 0 (omitted) 18 | 0 (omitted) 19 | 0 (omitted) 20 | 0 (omitted) 21 | 0 (omitted) 22 | 0 (omitted) 23 | 0 (omitted) 24 | 0 (omitted) 25 | 0 (omitted) 26 | 0 (omitted) 27 | 0 (omitted) 28 | 0 (omitted) 29 | 0 (omitted) 30 | 0 (omitted) 31 | 0 (omitted) 32 | 0 (omitted) 33 | 0 (omitted) 34 | 0 (omitted) 35 | 0 (omitted) 36 | 0 (omitted) 37 | 0 (omitted) 38 | 0 (omitted) 39 | 0 (omitted) 40 | 0 (omitted) 41 | 0 (omitted) 42 | 0 (omitted) 43 | 0 (omitted) 44 | 0 (omitted) 45 | 0 (omitted) 46 | 0 (omitted) 47 | 0 (omitted) 48 | 0 (omitted) 49 | 0 (omitted) 50 | 0 (omitted) 51 | 0 (omitted) 52 | 0 (omitted) 53 | 0 (omitted) 54 | 0 (omitted) 55 | 0 (omitted) 56 | 0 (omitted) 57 | 0 (omitted) 58 | 0 (omitted) 59 | 0 (omitted) 60 | 0 (omitted) 61 | 0 (omitted) 62 | 0 (omitted) 63 | 0 (omitted) 64 | 0 (omitted) 65 | 0 (omitted) 66 | 0 (omitted) 68 | 0 (omitted) 69 | 0 (omitted) 70 | 0 (omitted) 71 | 0 (omitted) 72 | 0 (omitted) 73 | 0 (omitted) 74 | 0 (omitted) 75 | 0 (omitted) 76 | 0 (omitted) 78 | 0 (omitted) 79 | 0 (omitted) 80 | 0 (omitted) 81 | 0 (omitted) 83 | 0 (omitted) 84 | 0 (omitted) 85 | 0 (omitted) 86 | 0 (omitted) 88 | 0 (omitted) 89 | 0 (omitted) 90 | 0 (omitted) 91 | 0 (omitted) 92 | 0 (omitted) 93 | 0 (omitted) 94 | 0 (omitted) 95 | 0 (omitted) 96 | 0 (omitted) 97 | 0 (omitted) 98 | 0 (omitted) 99 | 0 (omitted) 100 | 0 (omitted) 101 | 0 (omitted) 102 | 0 (omitted) 103 | 0 (omitted) 104 | 0 (omitted) 105 | 0 (omitted) 106 | 0 (omitted) 107 | 0 (omitted) 108 | 0 (omitted) 110 | 0 (omitted) 111 | 0 (omitted) 112 | 0 (omitted) 113 | 0 (omitted) 114 | 0 (omitted) 115 | 0 (omitted) 116 | 0 (omitted) 118 | 0 (omitted) 119 | 0 (omitted) 120 | 0 (omitted) 121 | 0 (omitted) 122 | 0 (omitted) 123 | 0 (omitted) 125 | 0 (omitted) 126 | 0 (omitted) 127 | 0 (omitted) 129 | 0 (omitted) 131 | 0 (omitted) 132 | 0 (omitted) 133 | 0 (omitted) 134 | 0 (omitted) 135 | 0 (omitted) 136 | 0 (omitted) 137 | 0 (omitted) 138 | 0 (omitted) 139 | 0 (omitted) 140 | 0 (omitted) 141 | 0 (omitted) 142 | 0 (omitted) 143 | 0 (omitted) 144 | 0 (omitted) 145 | 0 (omitted) 146 | 0 (omitted) 148 | 0 (omitted) 149 | 0 (omitted) 150 | 0 (omitted) 151 | 0 (omitted) 152 | 0 (omitted) 153 | 0 (omitted) 155 | 0 (omitted) 156 | 0 (omitted) 157 | 0 (omitted) 158 | 0 (omitted) 159 | 0 (omitted) 160 | 0 (omitted) 161 | 0 (omitted) 162 | 0 (omitted) 163 | 0 (omitted) 164 | 0 (omitted) 165 | 0 (omitted) 170 | 0 (omitted) 171 | 0 (omitted) 172 | 0 (omitted) 173 | 0 (omitted) 174 | 0 (omitted) 175 | 0 (omitted) 176 | 0 (omitted) 177 | 0 (omitted) 178 | 0 (omitted) 180 | 0 (omitted) 183 | 0 (omitted) 184 | 0 (omitted) 185 | 0 (omitted) 186 | 0 (omitted) 187 | 0 (omitted) 192 | 0 (omitted) 193 | 0 (omitted) 194 | 0 (omitted) 195 | 0 (omitted) 196 | 0 (omitted) 197 | 0 (omitted) 199 | 0 (omitted) 201 | 0 (omitted) 203 | 0 (omitted) 204 | 0 (omitted) 206 | 0 (omitted) 210 | 0 (omitted) 211 | 0 (omitted) 212 | 0 (omitted) 213 | 0 (omitted) 214 | 0 (omitted) 217 | 0 (omitted) 219 | 0 (omitted) 222 | 0 (omitted) 223 | 0 (omitted) 224 | 0 (omitted) 227 | 0 (omitted) 229 | 0 (omitted) 230 | 0 (omitted) 233 | 0 (omitted) 235 | 0 (omitted) 236 | 0 (omitted) 238 | 0 (omitted) 239 | 0 (omitted) 240 | 0 (omitted) 243 | 0 (omitted) 244 | 0 (omitted) 246 | 0 (omitted) 248 | 0 (omitted) 249 | 0 (omitted) 255 | 0 (omitted) 256 | 0 (omitted) 260 | 0 (omitted) 267 | 0 (omitted) 268 | 0 (omitted) 269 | 0 (omitted) 270 | 0 (omitted) 271 | 0 (omitted) 273 | 0 (omitted) 275 | 0 (omitted) 276 | 0 (omitted) 281 | 0 (omitted) 285 | 0 (omitted) 286 | 0 (omitted) 287 | 0 (omitted) 288 | 0 (omitted) 289 | 0 (omitted) 290 | 0 (omitted) 292 | 0 (omitted) 293 | 0 (omitted) 296 | 0 (omitted) 297 | 0 (omitted) 298 | 0 (omitted) 299 | 0 (omitted) 300 | 0 (omitted) 306 | 0 (omitted) 307 | 0 (omitted) 309 | 0 (omitted) 310 | 0 (omitted) 311 | 0 (omitted) 313 | 0 (omitted) 315 | 0 (omitted) 316 | 0 (omitted) 317 | 0 (omitted) 318 | 0 (omitted) 322 | 0 (omitted) 324 | 0 (omitted) 326 | 0 (omitted) 328 | 0 (omitted) 331 | 0 (omitted) 332 | 0 (omitted) 335 | 0 (omitted) 336 | 0 (omitted) 342 | 0 (omitted) 344 | 0 (omitted) 348 | 0 (omitted) 350 | 0 (omitted) 353 | 0 (omitted) 359 | 0 (omitted) 366 | 0 (omitted) 368 | 0 (omitted) 369 | 0 (omitted) 376 | 0 (omitted) 380 | 0 (omitted) 382 | 0 (omitted) 384 | 0 (omitted) 385 | 0 (omitted) 390 | 0 (omitted) 391 | 0 (omitted) 392 | 0 (omitted) 393 | 0 (omitted) 400 | 0 (omitted) 402 | 0 (omitted) 412 | 0 (omitted) 413 | 0 (omitted) 417 | 0 (omitted) 422 | 0 (omitted) 428 | 0 (omitted) 431 | 0 (omitted) 435 | 0 (omitted) 436 | 0 (omitted) 437 | 0 (omitted) 438 | 0 (omitted) 440 | 0 (omitted) 444 | 0 (omitted) 445 | 0 (omitted) 446 | 0 (omitted) 447 | 0 (omitted) 448 | 0 (omitted) 462 | 0 (omitted) 473 | 0 (omitted) 487 | 0 (omitted) | _cons | 6.866597 .1807507 37.99 0.000 6.511587 7.221608 -----------------------------------+---------------------------------------------------------------- sigma_u | 4.1711054 sigma_e | 3.1729999 rho | .63344096 (fraction of variance due to u_i) ---------------------------------------------------------------------------------------------------- . sum ln_trip_length_yearly Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- ln_trip_le~y | 116,554 2.077273 .820816 -1.467504 4.803636 . margins, dydx(Uber_Dummy) at(ln_trip_length_yearly =(-1.5(0.5)5)) Average marginal effects Number of obs = 116,554 Model VCE : Robust Expression : Linear prediction, predict() dy/dx w.r.t. : 1.Uber_Dummy 1._at : ln_trip_le~y = -1.5 2._at : ln_trip_le~y = -1 3._at : ln_trip_le~y = -.5 4._at : ln_trip_le~y = 0 5._at : ln_trip_le~y = .5 6._at : ln_trip_le~y = 1 7._at : ln_trip_le~y = 1.5 8._at : ln_trip_le~y = 2 9._at : ln_trip_le~y = 2.5 10._at : ln_trip_le~y = 3 11._at : ln_trip_le~y = 3.5 12._at : ln_trip_le~y = 4 13._at : ln_trip_le~y = 4.5 14._at : ln_trip_le~y = 5 ------------------------------------------------------------------------------- | Delta-method | dy/dx Std. Err. z P>|z| [95% Conf. Interval] --------------+---------------------------------------------------------------- 1.Uber_Dummy | _at | 1 | . (not estimable) 2 | . (not estimable) 3 | . (not estimable) 4 | . (not estimable) 5 | . (not estimable) 6 | . (not estimable) 7 | . (not estimable) 8 | . (not estimable) 9 | . (not estimable) 10 | . (not estimable) 11 | . (not estimable) 12 | . (not estimable) 13 | . (not estimable) 14 | . (not estimable) ------------------------------------------------------------------------------- Note: dy/dx for factor levels is the discrete change from the base level. .
Comment