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Stata Technical Bulletin

STB-57

inflate

fem I	.1097465	.2800813	0.392	0.695	-.4392028	.6586958
mar I	-.3540108	.3176103	-1.115	0.265	-.9765156	.2684941
kid5 I	.2171001	.196481	1.105	0.269	-.1679956	.6021958
phd I	.0012702	.1452639	0.009	0.993	-.2834418	.2859821
ment I	-.134111	.0452462	-2.964	0.003	-.2227918	-.0454302
cons I	-.5770618	.5093853	-1.133	0.257	-1.575439	.421315

Iistcoef makes the interpretation of coefficients explicit.

. Iistcoef fem phd, help

zip (N=915): Factor Change in Expected Count
Observed SD: 1.926069

Count Equation: Factor Change in Expected Count for Those Not Always O

—

art I

P>∣z∣

e^b

e^bStdX

—

SDofX

^^ ^^ +”

fem I

-0.20914

-3.299

0.001

0.8113

0.9010

0.4987

phd I

0.10375

1.459

0.145

1.1093

1.0503

0.4732

b = raw coefficient

z = z-score for test of b=0

P>∣z∣ = р-value for z-test

e^b = exp(b) = factor change in expected count for unit increase in X
e^bStdX = exp(b*SD of X) = change in expected count for SD increase in X
SDofX = standard deviation of X

Binary Equation: Factor Change in Odds of Always O

—

AlwaysO I

P>∣z∣

e^b

e^bStdX

—

SDofX

^^ ^^ ^^—^^ ^^—+^-fem I

0.10975

0.392

0.695

1.1160

1.0563

0.4987

phd I

-0.35401

-1.115

0.265

0.7019

0.8458

0.4732

b = raw coefficient

z = z-score for test of b=0

P>∣z∣ = р-value for z-test

e^b = exp(b) = factor change in odds for unit increase in X
e^bStdX = exp(b*SD of X) = change in odds for SD increase in X
SDofX = standard deviation of X

Saved Results

When the matrix option is specified, Iistcoef saves in r(.) whichever of the following are computed for a particular
model. Since saving these matrices can noticeably slow execution for mlogit, matrices are only saved when the matrix option
is specified. The row and column labels of matrices describe each coefficient that is included in each of the following matrices
(details on the computation of these coefficients are given in the next section).

r(b)
r(bJact)
r(b_facts)
r(b_p)
r(b.pct)
r(b.pcts)
r(b.sdx)
r(b-std)
r(b_xs)

slope or regression coefficients

factor change coefficients

^-standardized factor change coefficients

ρ-values for test of regression coefficients

percent change coefficients

^-standardized percent change coefficients

standard deviations for independent variables in finding x- and fully-standardized coefficients
fully standardized coefficients

^-standardized coefficients

r(b.ys)
r(b_z)
r(cons)
r(cons_p)
r(cons-z)
r(contrast)
r(pvalue)

o or y*-standardized coefficients

^-values or t-values for regression

constant or constants

ρ-values or /-values for constant or constants

^-values or /-values for constant or constants
all contrast from mlogit

a scalar indicating the value specified by the pvalue option

For zip and zinb, the matrices cons2, cons2_p, cons2_z, b2, b2_p, b2_z, b2_f act, b2_f acts, b2_pct, and b2_pcts provide
corresponding results for the binary equation.

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