## Stata 15 help for mcc

```
[R] epitab -- Tables for epidemiologists (mcc and mcci)

Syntax

mcc var_exposed_case var_exposed_control [if] [in] [weight] [,
level(#)]

mcci #a #b #c #d [, level(#)]

fweights are allowed; see weight.

mcc

Statistics > Epidemiology and related > Tables for epidemiologists >
Matched case-control studies

mcci

Statistics > Epidemiology and related > Tables for epidemiologists >
Matched case-control calculator

Description

mcc is used with matched case-control data.  It calculates McNemar's
chi-squared; point estimates and confidence intervals for the difference,
ratio, and relative difference of the proportion with the factor; and the
odds ratio and its confidence interval.  mcci is the immediate form of
mcc; see immed.  Also see [R] clogit and [R] symmetry for related
commands.

Option

+---------+
----+ Options +----------------------------------------------------------

level(#) specifies the confidence level, as a percentage, for confidence
intervals.  The default is level(95) or as set by set level.

Examples

Setup
. webuse mccxmpl

List the data
. list

Calculate odds ratio, etc.
. mcc case control [fw=pop]

Immediate form of above command
. mcci 8 8 3 8

Same as above command, but report 90% confidence intervals rather than
95%
. mcci 8 8 3 8, level(90)

Stored results

mcc and mcci store the following in r():

Scalars
r(p_exact)     two-sided p-value for McNemar's test
r(or)          odds ratio
r(lb_or)       lower bound of CI for or
r(ub_or)       upper bound of CI for or
r(D_f)         difference in proportion with factor
r(lb_D_f)      lower bound of CI for D_f
r(ub_D_f)      upper bound of CI for D_f
r(R_f)         ratio of proportion with factor
r(lb_R_f)      lower bound of CI for R_f
r(ub_R_f)      upper bound of CI for R_f
r(RD_f)        relative difference in proportion with factor
r(lb_RD_f)     lower bound of CI for RD_f
r(ub_RD_f)     upper bound of CI for RD_f
r(chi2)        chi-squared

```