Data Frame Properties

A data base of the collection is maintained in a single file of comma-separated variables which can be read in by any number of editors or computer programs. The programming language R (R Core Team 2016) is used to query and manipulate the data from this file and to generate all the tables for this online book. The book itself is generated through the use of the bookdown package in R (Xie 2016) and is processed through the user interface Rstudio (RStudio 2019).

The data file is read into R to create a “data frame”; a summary of its present properties is produced below.

##     Maker              Model              circa               Year          
##  Length:225         Length:225         Length:225         Length:225        
##  Class :character   Class :character   Class :character   Class :character  
##  Mode  :character   Mode  :character   Mode  :character   Mode  :character  
##                                                                             
##                                                                             
##                                                                             
##     Serial              Type               Mat                 Size      
##  Length:225         Length:225         Length:225         Min.   :  2.0  
##  Class :character   Class :character   Class :character   1st Qu.:  8.0  
##  Mode  :character   Mode  :character   Mode  :character   Median : 10.0  
##                                                           Mean   : 14.3  
##                                                           3rd Qu.: 10.0  
##                                                           Max.   :500.0  
##      Case              Notes            References          Country         
##  Length:225         Length:225         Length:225         Length:225        
##  Class :character   Class :character   Class :character   Class :character  
##  Mode  :character   Mode  :character   Mode  :character   Mode  :character  
##                                                                             
##                                                                             
##                                                                             
##     imFile              ScFr               ScBk             ModelLnk        
##  Length:225         Length:225         Length:225         Length:225        
##  Class :character   Class :character   Class :character   Class :character  
##  Mode  :character   Mode  :character   Mode  :character   Mode  :character  
##                                                                             
##                                                                             
## 

Levels of variable Type: C, H, L, S

Levels of variable Mat: Al, iv, Mg, pl, pp, ss, wd

Levels of variable Size: 2, 3.75, 4, 5, 5.5, 6.5, 7.5, 8, 9, 10, 11, 12, 15, 16, 20, 26, 30, 40, 50, 66, 468, 500

Levels of variable Country: CHN, DEN, EGER, FRA, GER, JPN, UK, USA, USSR

Other informational components will be added as time permits, such as better references to established Oughtred Society articles, more complete sets of pictures of the rules, whether instructions are included with the rule, etc.