Computed theoretical power for N=100 and N=200 scenarios

Modules/ado/plus/f/fitstat.hlp

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+.-
+help for ^fitstat^ - 03Nov2005
+.-
+
+To document: ztp and ztnb
+           : option nostata to supress bic aic based on stata formula
+
+Compute fit statistics for single equation regression models.
+-------------------------------------------------------------
+
+    ^fitstat^ [^, s^aving^(name)^ ^u^sing^(name)^ ^b^ic ^force^ ^save^ ^diff^]
+
+Description
+-----------
+
+^fitstat^ is a post-estimation command that computes a variety of measures
+of fit for many kinds of regression models.  It works after the following:
+^clogit^, ^cnreg^, ^cloglog^, ^intreg^, ^logistic^, ^logit^, ^mlogit^, ^nbreg^, ^ocratio^,
+^ologit^, ^oprobit^, ^poisson^, ^probit^, ^regress^, ^zinb^, and ^zip^.  With the ^s^aving^()^
+and ^u^sing^()^ options, it can also be used to compare fit measures for two
+different models.
+
+For all models, ^fitstat^ reports the log-likelihoods of the full and
+intercept-only models, the deviance (D), the likelihood ratio chi-square
+(G2), Akaike's Information Criterion (AIC), AIC*N, the Bayesian Information
+Criterion (BIC), and BIC'.
+
+For all models except ^regress^, ^fitstat^ reports McFadden's R2, McFadden's
+adjusted R2, the maximum likelihood R2, and Cragg & Uhler's R2.  These
+measures all equal R2 for OLS regression.  ^fitstat^ reports R2 and the
+adjusted R2 after ^regress^.
+
+fitstat reports the regular and adjusted count R2 for categorical data models.
+For ordered or binary logit or probit models, as well as models for censored
+data (^tobit^, ^cnreg^, or ^intreg^), it also reports McKelvey and Zavonia's R2.
+In addition, it reports Efron's R2 for ^logit^ or ^probit^.
+
+Not all measures are provided for models estimated with ^pweight^s or ^iweight^s.
+
+Options
+-------
+
+^saving(^name^)^ saves the computed measures in a matrix for subsequent
+    comparisons.  Name cannot be longer than 4 characters.
+
+^using(^name^)^ compares the fit measures for the current model with those of
+    the model saved as name.  Name cannot be longer than 4 characters.
+
+^bic^ only presents information measures.
+
+^force^ will compare two models even when the number of observations or the
+    estimation method varies between the two models.
+
+^save^ and ^diff^ are equivalents of saving(0) and using(0) and do not require
+    the user to provide model names.
+
+Examples
+--------
+
+To compute fit statistics for a single model:
+
+ . ^use mroz,clear^
+ . ^logit lfp k5 k618 age wc hc lwg inc^
+ . ^fitstat^
+
+To compute and save fit measures:
+
+ . ^logit lfp k5 k618 age wc hc lwg inc^
+ . ^fitstat, saving(mod1)^
+
+To compare saved model to current model:
+
+ . ^logit lfp k5 k618 age age2 wc hc lwg inc^
+ . ^fitstat, using(mod1)^
+
+.-
+Authors: J. Scott Long and Jeremy Freese
+         www.indiana.edu/~jslsoc/spost.htm
+         spostsup@@indiana.edu