% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/estimate.default.R
\name{estimate.default}
\alias{estimate.default}
\alias{estimate}
\alias{estimate.estimate}
\alias{merge.estimate}
\title{Estimation of functional of parameters}
\usage{
\method{estimate}{default}(
  x = NULL,
  f = NULL,
  ...,
  data,
  id,
  iddata,
  stack = TRUE,
  average = FALSE,
  subset,
  score.deriv,
  level = 0.95,
  IC = robust,
  type = c("robust", "df", "mbn"),
  keep,
  use,
  regex = FALSE,
  contrast,
  null,
  vcov,
  coef,
  robust = TRUE,
  df = NULL,
  print = NULL,
  labels,
  label.width,
  only.coef = FALSE,
  back.transform = NULL,
  folds = 0,
  cluster,
  R = 0,
  null.sim
)
}
\arguments{
\item{x}{model object (\code{glm}, \code{lvmfit}, ...)}

\item{f}{transformation of model parameters and (optionally) data, or contrast matrix (or vector)}

\item{...}{additional arguments to lower level functions}

\item{data}{\code{data.frame}}

\item{id}{(optional) id-variable corresponding to ic decomposition of model parameters.}

\item{iddata}{(optional) id-variable for 'data'}

\item{stack}{if TRUE (default)  the i.i.d. decomposition is automatically stacked according to 'id'}

\item{average}{if TRUE averages are calculated}

\item{subset}{(optional) subset of data.frame on which to condition (logical expression or variable name)}

\item{score.deriv}{(optional) derivative of mean score function}

\item{level}{level of confidence limits}

\item{IC}{if TRUE (default) the influence function decompositions are also returned (extract with \code{IC} method)}

\item{type}{type of small-sample correction}

\item{keep}{(optional) index of parameters to keep from final result}

\item{use}{(optional) index of parameters to use in calculations}

\item{regex}{If TRUE use regular expression (perl compatible) for keep,use arguments}

\item{contrast}{(optional) Contrast matrix for final Wald test}

\item{null}{(optional) null hypothesis to test}

\item{vcov}{(optional) covariance matrix of parameter estimates (e.g. Wald-test)}

\item{coef}{(optional) parameter coefficient}

\item{robust}{if TRUE robust standard errors are calculated. If
FALSE p-values for linear models are calculated from t-distribution}

\item{df}{degrees of freedom (default obtained from 'df.residual')}

\item{print}{(optional) print function}

\item{labels}{(optional) names of coefficients}

\item{label.width}{(optional) max width of labels}

\item{only.coef}{if TRUE only the coefficient matrix is return}

\item{back.transform}{(optional) transform of parameters and confidence intervals}

\item{folds}{(optional) aggregate influence functions (divide and conquer)}

\item{cluster}{(obsolete) alias for 'id'.}

\item{R}{Number of simulations (simulated p-values)}

\item{null.sim}{Mean under the null for simulations}
}
\description{
Estimation of functional of parameters.
Wald tests, robust standard errors, cluster robust standard errors,
LRT (when \code{f} is not a function)...
}
\details{
influence function decomposition
\deqn{\sqrt{n}(\widehat{\theta}-\theta) = \sum_{i=1}^n\epsilon_i + o_p(1)}
can be extracted with the \code{IC} method.
}
\examples{

## Simulation from logistic regression model
m <- lvm(y~x+z);
distribution(m,y~x) <- binomial.lvm("logit")
d <- sim(m,1000)
g <- glm(y~z+x,data=d,family=binomial())
g0 <- glm(y~1,data=d,family=binomial())

## LRT
estimate(g,g0)

## Plain estimates (robust standard errors)
estimate(g)

## Testing contrasts
estimate(g,null=0)
estimate(g,rbind(c(1,1,0),c(1,0,2)))
estimate(g,rbind(c(1,1,0),c(1,0,2)),null=c(1,2))
estimate(g,2:3) ## same as cbind(0,1,-1)
estimate(g,as.list(2:3)) ## same as rbind(c(0,1,0),c(0,0,1))
## Alternative syntax
estimate(g,"z","z"-"x",2*"z"-3*"x")
estimate(g,z,z-x,2*z-3*x)
estimate(g,"?")  ## Wildcards
estimate(g,"*Int*","z")
estimate(g,"1","2"-"3",null=c(0,1))
estimate(g,2,3)

## Usual (non-robust) confidence intervals
estimate(g,robust=FALSE)

## Transformations
estimate(g,function(p) p[1]+p[2])

## Multiple parameters
e <- estimate(g,function(p) c(p[1]+p[2],p[1]*p[2]))
e
vcov(e)

## Label new parameters
estimate(g,function(p) list("a1"=p[1]+p[2],"b1"=p[1]*p[2]))
##'
## Multiple group
m <- lvm(y~x)
m <- baptize(m)
d2 <- d1 <- sim(m,50,seed=1)
e <- estimate(list(m,m),list(d1,d2))
estimate(e) ## Wrong
ee <- estimate(e, id=rep(seq(nrow(d1)), 2)) ## Clustered
ee
estimate(lm(y~x,d1))

## Marginalize
f <- function(p,data)
  list(p0=lava:::expit(p["(Intercept)"] + p["z"]*data[,"z"]),
       p1=lava:::expit(p["(Intercept)"] + p["x"] + p["z"]*data[,"z"]))
e <- estimate(g, f, average=TRUE)
e
estimate(e,diff)
estimate(e,cbind(1,1))

## Clusters and subset (conditional marginal effects)
d$id <- rep(seq(nrow(d)/4),each=4)
estimate(g,function(p,data)
         list(p0=lava:::expit(p[1] + p["z"]*data[,"z"])),
         subset=d$z>0, id=d$id, average=TRUE)

## More examples with clusters:
m <- lvm(c(y1,y2,y3)~u+x)
d <- sim(m,10)
l1 <- glm(y1~x,data=d)
l2 <- glm(y2~x,data=d)
l3 <- glm(y3~x,data=d)

## Some random id-numbers
id1 <- c(1,1,4,1,3,1,2,3,4,5)
id2 <- c(1,2,3,4,5,6,7,8,1,1)
id3 <- seq(10)

## Un-stacked and stacked i.i.d. decomposition
IC(estimate(l1,id=id1,stack=FALSE))
IC(estimate(l1,id=id1))

## Combined i.i.d. decomposition
e1 <- estimate(l1,id=id1)
e2 <- estimate(l2,id=id2)
e3 <- estimate(l3,id=id3)
(a2 <- merge(e1,e2,e3))

## If all models were estimated on the same data we could use the
## syntax:
## Reduce(merge,estimate(list(l1,l2,l3)))

## Same:
IC(a1 <- merge(l1,l2,l3,id=list(id1,id2,id3)))

IC(merge(l1,l2,l3,id=TRUE)) # one-to-one (same clusters)
IC(merge(l1,l2,l3,id=FALSE)) # independence


## Monte Carlo approach, simple trend test example

m <- categorical(lvm(),~x,K=5)
regression(m,additive=TRUE) <- y~x
d <- simulate(m,100,seed=1,'y~x'=0.1)
l <- lm(y~-1+factor(x),data=d)

f <- function(x) coef(lm(x~seq_along(x)))[2]
null <- rep(mean(coef(l)),length(coef(l))) ## just need to make sure we simulate under H0: slope=0
estimate(l,f,R=1e2,null.sim=null)

estimate(l,f)
}