line.colors

Set before calling nca_output
 &gt; line.colors["ce_fdh"] &lt;- "blue"
Reset one line color by setting it to NULL
 &gt; line.colors["ce_fdh"] &lt;- NULL
Reset all line colors by setting line.colors to NULL
 &gt; line.colors &lt;- NULL

Parameter

Performs a Necessary Condition Analysis (NCA). (Dul, J. 2016. Necessary Condition Analysis (NCA). ''Logic and Methodology of 'Necessary but not Sufficient' causality." Organizational Research Methods 19(1), 10-52)
NCA identifies necessary (but not sufficient) conditions in datasets. Instead of drawing a regression line ''through the middle of the data'' in an xy-plot, NCA draws the ceiling line. The ceiling line y = f(x) separates the area with observations from the area without observations.
(Nearly) all observations are below the ceiling line: y <= f(x). The empty zone is in the upper left hand corner of the xy-plot (with the convention that the x-axis is ''horizontal'' and the y-axis is ''vertical'' and that values increase ''upwards'' and ''to the right''). The ceiling line is a (piecewise) linear non-decreasing line: a linear step function or a straight line. It indicates which level of x (e.g. an effort or input) is necessary but not sufficient for a (desired) level of y (e.g. good performance or output).

Govert Buijs

Necessary Condition Analysis

line.colors function

This is a list with line colors for each ceiling technique<table><tr><td>
 </td>
<td> ols </td>
<td> "green" </td>
<td> cols </td>
<td> "red3"</td>
</tr><tr><td>
 </td>
<td> lh </td>
<td> "darkgreen" </td>
<td> qr </td>
<td> "blue"</td>
</tr><tr><td>
 </td>
<td> ce_vrs </td>
<td> "orchid4" </td>
<td> cr_vrs </td>
<td> "violet"</td>
</tr><tr><td>
 </td>
<td> ce_fdh </td>
<td> "red" </td>
<td> cr_fdh </td>
<td> "orange"</td>
</tr></table>

line.colors: a set defining the line colors for the plots

Description

Arguments

Format

ols	"green"	cols	"red3"
lh	"darkgreen"	qr	"blue"
ce_vrs	"orchid4"	cr_vrs	"violet"
ce_fdh	"red"	cr_fdh	"orange"