GBNLQREG(1)

✨ GBNLQREG ✨

okay bestie, so this is gbnlqreg from the gbnlqreg 6.2 era (a User Command, no cap) — it's the Non linear quantile regression girlie 💅 and she's about to eat.

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🌸 SYNOPSIS 🌸

gbnlqreg [options] <function definition>

that's it. that's the whole vibe. you give her options, you give her a function, she gives you answers 🫶

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💖 DESCRIPTION 💖

Non linear quantile regression. periodt.

She reads your data in columns — <pink>X_1 .. X_N</pink> — and you tell her the model by handing over a function f(x1,x2...) where the variable names are x1, x2, .., xN and they map to the first, second, .. N-th column of data. so like, first column = x1, second = x2, you get it 💖

and f(x1,x2,...) — these are assumed i.i.d. no notes. that's the whole assumption. iconic of her honestly ✨

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👑 OPTIONS 👑 (the main character section)

• -O — type of output (default 0)

0 — parameters

1 — parameters and errors

2 — <variables> and residuals

3 — parameters and variance matrix

• -V — variance matrix estimation (default 0)

0 — <gradF gradF^t> 1 — < J^{-1} > 2 — < H^{-1} > 3 — < H^{-1} J H^{-1} >

• -q — set the quantile (default .5) 🎀
• -M — choose optimization method (default 0)

0 — Nelder-Mead Simplex o(N)

1 — Nelder-Mead Simplex o(N^2)

• -s — initial simplex scaling (default 1)
• -e — minimization tolerance (default 1e-5)
• -F — input fields separators (default " \t") — yes, that's a space and a tab, she said what she said 🦋
• -h — this help 🥰 (hi, that's me, the help)
• -v — verbosity level (default 0)

0 — just results

1 — comment headers

2 — summary statistics

2 — summary statistics

3 — covariance matrix

4 — minimization steps

5 — model definition

• -N — max minimization steps (default 500)

ok not me pointing out that level 2 — summary statistics — is listed twice in the original. bestie that's canon, we don't edit the canon, we just appreciate the double feature 🫶 (and yes, -v really does jump from 2 straight to 3, nothing was lost in translation, that's just her)

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💜 AUTHOR 💜

Written by Giulio Bottazzi — the actual legend behind all this 🌟

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🐛 REPORTING BUGS 🐛

found a bug? don't be shy, tell the group chat:

Report bugs to <gbutils@googlegroups.com>

Package home page: <http://cafim.sssup.it/~giulio/software/gbutils/index.html>

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🌈 COPYRIGHT 🌈

Copyright © 2001-2018 Giulio Bottazzi. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License (version 2) as published by the Free Software Foundation;

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

💀 bestie listen. that ALL CAPS part is not me being dramatic, that is literally the license. NO WARRANTY. she's free, she's GPL v2, she comes with zero promises and we respect her for it 🙈

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and that's the whole page, bestie 💖 slay, go run your regressions, and remember: gbnlqreg 6.2, dated June 2021, the GBNLQREG(1) girlie herself, signing off 🎀✨