# summary.l1ce

##### Summary Method for ``l1ce'' Objects (Regression with L1 Constraint)

Returns a summary list for a regression model with an L1 constraint on the parameters. A null value will be returned if printing is invoked.

- Keywords
- regression

##### Usage

```
## S3 method for class 'l1ce':
summary(object, correlation = TRUE,
type = c("OPT", "Tibshirani"),
gen.inverse.diag = 0, sigma = NULL, ...)
## S3 method for class 'summary.l1ce':
print(x, digits = max(3, getOption("digits") - 3), ...)
```

##### Details

This function is a method for the generic function
`summary()`

for class `"l1ce"`

.
It can be invoked by calling `summary(x)`

for an
object `x`

of the appropriate class, or directly by
calling `summary.l1ce(x)`

regardless of the
class of the object.

##### Value

an object of class `summary.l1ce`

(for which there's a
`print`

method).
It is basically a list with the following components:

##### See Also

##### Examples

```
data(Prostate)
summary(l1ce(lpsa ~ .,Prostate))
# Produces the following output:
Call:
l1ce(formula = lpsa ~ ., data = Prostate)
Residuals:
Min 1Q Median 3Q Max
-1.636 -0.4119 0.076 0.452 1.83
Coefficients:
Value Std. Error Z score Pr(>|Z|)
(Intercept) 0.7285 1.3898 0.5242 0.6002
lcavol 0.4937 0.0919 5.3711 0.0000
lweight 0.2682 0.1774 1.5115 0.1307
age 0.0000 0.0111 0.0000 1.0000
lbph 0.0093 0.0587 0.1581 0.8744
svi 0.4551 0.2525 1.8023 0.0715
lcp 0.0000 0.0947 0.0000 1.0000
gleason 0.0000 0.1685 0.0000 1.0000
pgg45 0.0002 0.0046 0.0391 0.9688
Residual standard error: 0.7595 on 88.36 degrees of freedom
The relative L1 bound was : 0.5
The absolute L1 bound was : 0.9219925
The Lagrangian for the bound is: 13.05806
Correlation of Coefficients:
(Intercept) lcavol lweight age lbph svi lcp gleason
lcavol 0.1988
lweight -0.4815 -0.2071
age -0.3938 -0.0603 -0.0974
lbph 0.3629 -0.0201 -0.5165 -0.1303
svi -0.0624 -0.2273 -0.1442 0.0635 0.0648
lcp 0.0457 -0.4153 0.0598 0.0665 0.0632 -0.3779
gleason -0.7666 -0.2009 0.1163 -0.0774 -0.0617 0.1084 -0.0243
pgg45 0.4988 0.0956 -0.0380 -0.0630 -0.1111 -0.1921 -0.2935 -0.6526
```

*Documentation reproduced from package lasso2, version 1.2-9, License: GPL version 2 or later*