No F model (regression)

[Elene Timmermans]

Hello everyone

I am running multiple regressions and sometimes I don't get a value by F(X , X), see regression 3. I assume I can't interpret my results then?

Is there something I can do to resolve this?


OUTPUT:
regression 1:


. reg hirinv $X_CC_nref, cluster (id_resp)

Linear regression Number of obs = 870
F(14, 173) = 10.97
Prob > F = 0.0000
R-squared = 0.1114
Root MSE = 2.3081

(Std. err. adjusted for 174 clusters in id_resp)

regression 2:

reg hirinv $X_CC_nref $X_VC_nref, cluster (id_resp)

Linear regression Number of obs = 870
F(19, 173) = 9.59
Prob > F = 0.0000
R-squared = 0.2170
Root MSE = 2.1729

(Std. err. adjusted for 174 clusters in id_resp)

regression 3:

reg hirinv $X_CC_nref $X_RP_nref, cluster (id_resp)

Linear regression Number of obs = 870
F(36, 173) = .
Prob > F = .
R-squared = 0.2477
Root MSE = 2.1554

(Std. err. adjusted for 174 clusters in id_resp)


Thank you in advance!

[Andrew Musau]

You are not showing your output. Can you show the exact result of

reg hirinv $X_CC_nref $X_RP_nref, cluster (id_resp)
testparm *

?

[Elene Timmermans]

Below you can find the exact result.


reg hirinv $X_CC_nref $X_RP_nref, cluster (id_resp)

Linear regression Number of obs = 870
F(36, 173) = .
Prob > F = .
R-squared = 0.2477
Root MSE = 2.1554

(Std. err. adjusted for 174 clusters in id_resp)
----------------------------------------------------------------------------------------
| Robust
hirinv | Coefficient std. err. t P>|t| [95% conf. interval]
-----------------------+----------------------------------------------------------------
X_CC_Vrouw | -.0417467 .1010749 -0.41 0.680 -.2412454 .1577521
X_CC_38±1jaar | -.1256057 .138322 -0.91 0.365 -.3986216 .1474103
X_CC_48±1jaar | -.4541572 .1452252 -3.13 0.002 -.7407985 -.1675159
X_CC_1_kind | -.2556333 .1197164 -2.14 0.034 -.4919262 -.0193405
X_CC_2_kinderen | -.3182638 .1659916 -1.92 0.057 -.6458933 .0093657
X_CC_tussen_20en40km | -.2666617 .1393962 -1.91 0.057 -.5417978 .0084745
X_CC_meer_40km | -.9817544 .1624262 -6.04 0.000 -1.302347 -.6611622
X_CC_tussen_1en5j | .9192035 .1646977 5.58 0.000 .5941278 1.244279
X_CC_meer_5j | 1.425546 .1642961 8.68 0.000 1.101263 1.749829
X_CC_sportvereniging | .4499945 .1403493 3.21 0.002 .172977 .7270119
X_CC_vrijwilliger | .3733182 .1422666 2.62 0.009 .0925165 .6541198
X_CC_vastewerkuren | -.056104 .1713236 -0.33 0.744 -.3942576 .2820495
X_CC_flexibelewerkuren | .0536301 .1364215 0.39 0.695 -.2156347 .3228949
X_CC_telewerk | -.4440486 .1518916 -2.92 0.004 -.7438479 -.1442492
X_RP_vrouw | .515363 .3449886 1.49 0.137 -.1655656 1.196292
X_RP_nonbinair | 4.1367 .985351 4.20 0.000 2.191842 6.081557
leeftijd_RP | -.0058137 .0162818 -0.36 0.721 -.0379502 .0263229
X_RP_master | .2424372 .4469949 0.54 0.588 -.6398285 1.124703
X_RP_UniBachelor | .8054848 .5062546 1.59 0.113 -.1937459 1.804716
X_RP_Bachelor | .2399066 .4326845 0.55 0.580 -.6141137 1.093927
X_RP_tussen1en5j | .0506197 .3455274 0.15 0.884 -.6313725 .7326118
X_RP_meer5j | .0679414 .3546005 0.19 0.848 -.6319589 .7678417
X_RP_1kind | -.693014 .4237398 -1.64 0.104 -1.529379 .1433515
X_RP_2kind | -.6173575 .3536591 -1.75 0.083 -1.3154 .0806846
X_RP_3kind | -.4709315 .7084199 -0.66 0.507 -1.86919 .9273274
X_RP_4kind | .5577606 .4458321 1.25 0.213 -.3222101 1.437731
X_RP_meer4kind | -1.174642 .973983 -1.21 0.229 -3.097062 .7477777
X_RP_tele_nietbel | .7208246 .8674331 0.83 0.407 -.9912899 2.432939
X_RP_tele_bel | .6993718 .7591317 0.92 0.358 -.7989807 2.197724
X_RP_tele_heelbel | .7678831 .8089732 0.95 0.344 -.8288451 2.364611
X_RP_tele_org_nietbel | 2.17703 .499835 4.36 0.000 1.19047 3.16359
X_RP_tele_org_bel | 2.037474 .4578345 4.45 0.000 1.133813 2.941134
X_RP_tele_org_heelbel | 2.331896 .624188 3.74 0.000 1.099892 3.563901
X_RP_flex_nietbel | -3.295377 .8655671 -3.81 0.000 -5.003808 -1.586945
X_RP_flex_bel | -2.260512 .4631531 -4.88 0.000 -3.17467 -1.346353
X_RP_flex_heelbel | -2.116132 .4905478 -4.31 0.000 -3.084362 -1.147903
X_RP_flex_org_nietbel | -1.129415 .7105675 -1.59 0.114 -2.531912 .2730832
X_RP_flex_org_bel | -1.767999 .7348567 -2.41 0.017 -3.218438 -.3175596
X_RP_flex_org_heelbel | -1.028039 .8298564 -1.24 0.217 -2.665986 .6099074
_cons | 7.850904 1.405718 5.58 0.000 5.076338 10.62547
----------------------------------------------------------------------------------------

[Carlo Lazzaro]

Elene:
see also -help j_robustsingular-.

[Andrew Musau]

None of your standard errors are missing and the absolute values of the estimated coefficients are neither too small nor too large, so just check on the last point in the -help- documentation suggested by Carlo.

I assume I can't interpret my results then?

You can, the fact that no F-statistic is reported is not a problem in itself.