bbasis

Construct a B-spline basis of degree <code>deg</code>
with <code>ndx-</code>1 equally-spaced internal knots (<code>ndx</code> segments) on range [<code>x1</code>,<code>xr</code>].
Code copied from Eilers &amp; Marx 2010, WIR: Comp Stat 2, 637-653.

Structural multivariate-univariate linear mixed model solver for estimation of multiple random effects with unknown variance-covariance structures (e.g., heterogeneous and unstructured) and known covariance among levels of random effects (e.g., pedigree and genomic relationship matrices) (Covarrubias-Pazaran, 2016 <doi:10.1371/journal.pone.0156744>; Maier et al., 2015 <doi:10.1016/j.ajhg.2014.12.006>; Jensen et al., 1997). REML estimates can be obtained using the Direct-Inversion Newton-Raphson and Direct-Inversion Average Information algorithms for the problems r x r (r being the number of records) or using the Henderson-based average information algorithm for the problem c x c (c being the number of coefficients to estimate). Spatial models can also be fitted using the two-dimensional spline functionality available.

Giovanny Covarrubias-Pazaran

sommer

Solving Mixed Model Equations in R

bbasis function

<dl><dt>x</dt>
<dd>A vector. Data values for spline.</dd>
<dt>xl</dt>
<dd>A numeric value. Lower bound for data (lower external knot).</dd>
<dt>xr</dt>
<dd>A numeric value. Upper bound for data (upper external knot).</dd>
<dt>ndx</dt>
<dd>A numeric value. Number of divisions for x range
(equal to number of segments = number of internal knots + 1)</dd>
<dt>deg</dt>
<dd>A numeric value. Degree of the polynomial spline.</dd></dl>

Arguments

Function for creating B-spline basis functions (Eilers &amp; Marx, 2010) — bbasis

<dl>

<dt>x</dt>
<dd>A vector. Data values for spline.</dd>


<dt>xl</dt>
<dd>A numeric value. Lower bound for data (lower external knot).</dd>


<dt>xr</dt>
<dd>A numeric value. Upper bound for data (upper external knot).</dd>


<dt>ndx</dt>
<dd>A numeric value. Number of divisions for x range
(equal to number of segments = number of internal knots + 1)</dd>


<dt>deg</dt>
<dd>A numeric value. Degree of the polynomial spline.</dd>

</dl>

bbasis: Function for creating B-spline basis functions (Eilers & Marx, 2010)

Description

Usage

Value

Arguments

Details