Hypothesis test memo no. 1

May 4th, 2024 – 6:10 am
Categorized as Economics Note and tagged as ,
Written by La Ecrivain

1. R2 is the coefficient of determination, which is the square of the Pearson correlation coefficient, r, the formula for which is ρ=β1(σx/σy), where β1 is the parameter estimate. ASCI and Unicode text does not have a circumflex, ^, on top of the β. For this documentation the objective is multiplatform long-term readability so an equation editor with specialized support for circumflexes is out of the question.

2. There is also the existence of the rejection region method. We reject the null hypothesis if the test statistic’s absolute value is greater than the critical value, which we can express with the formula Reject if |t| > tα/2,n-1

Library of PDF files

March 7th, 2024 – 1:23 am
Categorized as Historical Note and tagged as , ,
Written by La Ecrivain

The Holy Bible translated by Robert Young, 1863, prior to Westcott and Hort, complete with Revelation

A Defence of The True Church Called Quaker, 1659, John Cook

(come and coming out of the wilderness, Babylon, and the dark night of the apostacy of Antichrist into their own land, which is Sion the mountain of holiness, there to worship the Lord in spirit and truth) against the several sects and sorts of people, called Independants, Separatists or Brownists, Baptists, Fift-Monarchy-Men …

The extracted text is also available at the University of Michigan’s Digital Library.

The best Alias for ls

March 2nd, 2024 – 11:14 pm
Categorized as Computing Note and tagged as ,
Written by La Ecrivain

The best alias for ls is

ls –halF

It is easy to remember, and produces easy to read output with human readable file sizes and / marks present by the directory names..

A good version of ll

February 20th, 2024 – 3:37 am
Categorized as Computing Note and tagged as ,
Written by La Ecrivain

A really good version of the ll alias is:

ls –lahF, although on some versions ls –lahp looks better than F.

LS alias and Mozilla DRM bar

February 11th, 2024 – 3:11 am
Categorized as Computing Note and tagged as , ,
Written by La Ecrivain

Some useful aliases that are not always preconfigured on every Linux version:

alias ll=’ls -alF’
alias la=’ls -A’
alias l=’ls –CF’

To eliminate the DRM warning in Firefox and Librewolf without enable DRM, add this to "userChrome.css":

 notification[value="drmContentDisabled"]{ display:none !important; } 

toolkit.legacyUserProfileCustomizations.stylesheets must be set to true in about config.

Fess Search 14.3

February 3rd, 2024 – 2:41 am
Categorized as Computing Note and tagged as
Written by La Ecrivain

Fess 14.3 works straight out of the box without having to install separate search services.  Somewhere between this version and 14.11, completely separate installations of either Open Search or Elastic Search became necessary.  The linkage between those services and Fess seems easy to break causing a loss of the ability to search.  Fess uses the Apache license. Fess-14.3 for Windows is locally mirrored at this link.

Double Sided Scan and PDF

February 1st, 2024 – 1:15 pm
Categorized as Computing Note and tagged as , , , ,
Written by La Ecrivain

The following script scans PDFs via an auto-document feeder in Hp-Lip and then collates the pages to the correct order when there are reverse sides. No scans will be saved if no data is transmitted for the second set of scans. The second set of scans is the reverse of the pages.

#!/usr/bin/env bash

YMD=$(date +"%Y-%m-%d")
Y=$(date +"%Y")
WORKDIR=/home/username/Temp/
OUTPATH=/home/username/Scans/${Y}/
#  Create a folder, ~/Temp and create a folder, ~/Scans
mkdir -p "/home/username/Scans/${Y}"

hp-scan --adf --mode=color &&
PART=hpscan
LATESTSCAN=`ls -t ${PART}*pdf | sed "1q"`
echo "${LATESTSCAN} ready for ${FILEOUTPUT}"

#  Why you shouldn't parse the output of ls
#  http://mywiki.wooledge.org/ParsingLs 
#  This does not use the FILEOUTPUT variable itself because the cp command
#  seems to have trouble copying the file correctly, even with switches. 

# Thanks Elektropepi at https://github.com/qpdf/qpdf/issues/259
function pdfscanmerge() {
	if [ $# -ne 3 ]; then 
		echo "Usage: pdfscanmerge   ";
		return;
	fi
	let odd_pages=$(qpdf --show-npages $1)
	let even_page=$(qpdf --show-npages $2)
	argument=
	for (( odd_page=1; odd_page<=$odd_pages; odd_page++ ))
	do 
		argument+="$1 $odd_page "
		if [ even_page > 0 ]; then
			argument+="$2 $even_page "
		fi
		let even_page--
	done
	qpdf --empty --pages $argument -- $3
}

cp ${LATESTSCAN} "$WORKDIR$1-uncompressed-scanned-${YMD}.pdf"
gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress -sOutputFile="$OUTPATH${YMD}-$1.pdf" ${LATESTSCAN}
sleep 1
rm -f ${LATESTSCAN}
rm -f "$WORKDIR$1-uncompressed-scanned-${YMD}.pdf"
killall evince

read -p "Load the reverse sides and press any key:" n
hp-scan --adf --mode=color &&
PART=hpscan
LATESTSCAN=`ls -t ${PART}*pdf | sed "1q"`
echo "${LATESTSCAN} ready for ${FILEOUTPUT}"
cp ${LATESTSCAN} "$WORKDIR$1-uncompressed-scanned-reverse-${YMD}.pdf"
gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress -sOutputFile="$OUTPATH${YMD}-$1-reverse.pdf" ${LATESTSCAN}
sleep 1
rm -f ${LATESTSCAN}
rm -f "$WORKDIR$1-uncompressed-scanned-reverse-${YMD}.pdf"
killall evince

pdfscanmerge "$OUTPATH${YMD}-$1.pdf" "$OUTPATH${YMD}-$1-reverse.pdf" "$OUTPATH${YMD}-$1-collated.pdf"
rm -f "$OUTPATH${YMD}-$1.pdf"
rm -f "$OUTPATH${YMD}-$1-reverse.pdf"

Automated Database Restart

January 21st, 2024 – 7:41 pm
Categorized as Computing Note and tagged as , , ,
Written by La Ecrivain

Here is a script that checks to ensure the database is running and restarts the service if it is not running.  This was used on a very low memory server to ensure a database remained operational, despite it sometimes crashing due to out of memory errors.

#!/bin/bash

timestamp="$(date)"
systemctl stop httpd && echo "${timestamp}" Stopping Apache... >> /home/centos/administration/apache.log
systemctl is-active mariadb && echo "${timestamp}" MariaDB is active so not starting >> /home/centos/administration/mariadb_active.log || echo "${timestamp}" MariaDB is not Active >> /home/centos/administration/mariadb_inactive.log
systemctl is-active mariadb && echo "${timestamp}" No need to restart MariaDB || systemctl start mariadb
systemctl start httpd && echo "${timestamp}" restarting apache...>> /home/centos/administration/apache.log
  

AppImage Integration

January 21st, 2024 – 7:12 pm
Categorized as Computing Note and tagged as , ,
Written by La Ecrivain

To install AppImages and integrate them with the desktop environment like a conventional package,  use the AppImage Launcher. LibreWolf’s documentation contains a how-to document on using AppImage Launcher.

Thunderbird Row Highlighting

January 21st, 2024 – 7:09 pm
Categorized as Computing Note and tagged as ,
Written by La Ecrivain

Revisions: 21 January 2024, first publication

The Thunderbird developers are moving to a new user interface code base for Thunderbird 115 and Thunderbird 102 is the last version that will work with the historical userChrome.css customizations. The userbase for Mozilla products has continually shrunk over the past few years and the chances of equivalent customization abilities being discovered and written about strike me as pretty low.  Because of the change, I have mirrored Thunderbird 102.14 for Windows and Linux in 64-bit and 32-bit versions in the event that the old versions disappear from the Mozilla site. The Source is available on the Mozilla mirror as of August 11, 2023.  The releases are located here.

The userChrome.css below allows the following persistent tag colors.  It also contains text customization for the interface.  And it contains alternate row highlighting, where one row is light grey and the other white.  The alternate row highlighting conflicts with the background colors for tags.  One must choose which feature to have. The userChrome.css goes in the profile directory in a subfolder called chrome.

Screenshot 2024-01-21 151250

   
The code for highlighting the tag backgrounds was found on a French website located here. E.g. C:\Users\username\AppData\Roaming\Thunderbird\Profiles\1a2b3cde.default-release\chrome

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
/* set default namespace to XUL */
/* thanks to Jean-Claude, */
/* https://forums.mozfr.org/viewtopic.php?t=143173 */
/*Important tag IMPORTANT*/ 
treechildren::-moz-tree-row(T_24label1)
{
      border-bottom: 1px solid #FFFFFF !important;
      background-color:  #FF0033   !important;
}
treechildren::-moz-tree-cell-text(T_24label1)
{
      color: #FFFFFF !important;
}
treechildren::-moz-tree-row(T_24label1, selected)
{
      background-color: #b71c1c !important;
}
treechildren::-moz-tree-cell-text(T_24label1, selected)
{
  color: #00FF00  !important;
}

/*Travail tag   WORK*/
treechildren::-moz-tree-row(T_24label2)
{
  border-bottom: 1px solid #FFFFFF !important;
  background-color:  #FF9900   !important;
}
treechildren::-moz-tree-cell-text(T_24label2)
{
  color: #FFFFFF !important;
}
treechildren::-moz-tree-row(T_24label2, selected)
{
  background-color: #FF9900 !important;
}
treechildren::-moz-tree-cell-text(T_24label2, selected)
{
  color: #00FF00  !important;
}

/*Personnel tag PERSONAL*/ 
treechildren::-moz-tree-row(T_24label3)
{
  border-bottom: 1px solid #FFFFFF !important;
  background-color:  #009900   !important;
}
treechildren::-moz-tree-cell-text(T_24label3)
{
  color: #FFFFFF !important;
}
treechildren::-moz-tree-row(T_24label3, selected)
{
  background-color: #009900 !important;
}
treechildren::-moz-tree-cell-text(T_24label3, selected)
{
  color: #00FF00  !important;
}

/*A faire tag*/
treechildren::-moz-tree-row(T_24label4)
{
  border-bottom: 1px solid #FFFFFF !important;
  background-color:  #3333FF   !important;
}
treechildren::-moz-tree-cell-text(T_24label4)
{
  color: #FFFFFF !important;
}
treechildren::-moz-tree-row(T_24label4, selected)
{
  background-color: #3333FF !important;
}
treechildren::-moz-tree-cell-text(T_24label4, selected)
{
  color: #00FF00  !important;
}

/*Peut attendre tag*/
treechildren::-moz-tree-row(T_24label5)
{
  border-bottom: 1px solid #FFFFFF !important;
  background-color:  #993399  !important;
}
treechildren::-moz-tree-cell-text(T_24label5)
{
  color: #FFFFFF !important;
}
treechildren::-moz-tree-row(T_24label5, selected)
{
  background-color: #993399 !important;
}
treechildren::-moz-tree-cell-text(T_24label5, selected)
{
  color: #00FF00  !important;
}

/*test tag*/
treechildren::-moz-tree-row(Ttest)
{
  border-bottom: 1px solid #FFFFFF !important;
  background-color:  #FFCC33  !important;
}
treechildren::-moz-tree-cell-text(Ttest)
{
  color: #FFFFFF !important;
}
treechildren::-moz-tree-row(Ttest, selected)
{
  background-color: #FFCC33 !important;
}
treechildren::-moz-tree-cell-text(Ttest, selected)
{
  color: #00FF00  !important;
}


/* 9 August 2023 Additions */
/* Set Font Size In Folder Pane */

#folderTree >treechildren::-moz-tree-cell-text {
  /*font-family: Lucida Sans !important;*/
  font-size: 9pt !important; }

/* Set Font Size In Thread Pane */

#threadTree >treechildren::-moz-tree-cell-text {
  /*font-family: Lucida Sans !important;*/
  font-size: 9pt !important; }

#threadTree treechildren::-moz-tree-row    {
/*  border-bottom: 1px dotted grey !important;  */
  height: 24px !important; }

/* folder list spacing */

#folderTree treechildren::-moz-tree-row    {
  height: 24px !important; }

/* The silver background color on alternating rows */
#threadTree treechildren::-moz-tree-row(odd) {
  -moz-appearance: none !important;
  background-image: none !important;
  /* the !important property overrides previous styling rules */
  /* this line enables alternate color row highlighting, but
  tag backgrounds on this row cannot be highlighted.  Only one 
  background highlighting can be applied Disabled 9 August 2023
  to enable tag background highlights*/
  /* background-color:#F3F6FA !important; */

}

#threadTree treechildren::-moz-tree-row(selected) {
  background-color: -moz-Dialog !important;
}
#threadTree treechildren::-moz-tree-row(selected, focus) {
  background-color: Highlight !important;
}


#folderTree treechildren::-moz-tree-row(selected) {
  -moz-appearance: none !important;
  background-image: none !important;
  background-color: Highlight !important;
}
#folderTree treechildren::-moz-tree-row(selected, focus) {
  -moz-appearance: none !important;
  background-image: none !important;
  background-color: Highlight !important;
}