galaxy

<p>The astronomical position-velocity data is from a sample of 26 low surfaces brightness (LSB) galaxies. The data contain 318 stars with their radiuses in kiloparsec (kpc), observed velocities of stars in km/s (relative to center, corrected for inclination) from 26 LSB galaxies. It was known that the velocities were measured with errors. In the data set, each  velocity includes its estimated standard deviation of measurement errors.</p>

datasets

A collection of functions to deal
with nonparametric measurement error problems using
deconvolution kernel methods. We focus two measurement error
models in the package: (1) an additive measurement error model,
where the goal is to estimate the density or distribution
function from contaminated data; (2) nonparametric regression
model with errors-in-variables. The R functions allow the
measurement errors to be either homoscedastic or
heteroscedastic. To make the deconvolution estimators
computationally more efficient in R, we adapt the "Fast Fourier
Transform" (FFT) algorithm for density estimation with
error-free data to the deconvolution kernel estimation. Several
methods for the selection of the data-driven smoothing
parameter are also provided in the package. See details in:
Wang, X.F. and Wang, B. (2011). Deconvolution estimation in
measurement error models: The R package decon. Journal of
Statistical Software, 39(10), 1-24.

Xiao-Feng Wang

decon

Deconvolution Estimation in Measurement Error Models

galaxy function

<p>A data frame with 318 observations on 3 variables.</p><table><tr><td>
    <code>Rkpc</code>  </td>
<td> numeric  </td>
<td> radiuses in kiloparsec (kpc) </td>
</tr><tr><td>
    <code>V</code>   </td>
<td> numeric  </td>
<td> velocities of stars in km/s </td>
</tr><tr><td>
    <code>Err</code>  </td>
<td> numeric  </td>
<td> standard deviations of measurement errors in measuring velocities </td>
</tr></table>

galaxy: The observed position-velocity data of low surface brightness galaxies

Description

Usage

Arguments

Format

References

See Also

`Rkpc`	numeric	radiuses in kiloparsec (kpc)
`V`	numeric	velocities of stars in km/s
`Err`	numeric	standard deviations of measurement errors in measuring velocities