line.types

Set before calling nca_output
 &gt; line.types["ce_fdh"] &lt;- 1
Reset one line type by setting it to NULL
 &gt; line.types["ce_fdh"] &lt;- NULL
Reset all line types by setting line.types to NULL
 &gt; line.types &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.types function

This is a list with line types for each ceiling technique<table><tr><td>
 </td>
<td> ols </td>
<td> 1</td>
<td> cols </td>
<td> 3</td>
</tr><tr><td>
 </td>
<td> lh </td>
<td> 2</td>
<td> qr </td>
<td> 4</td>
</tr><tr><td>
 </td>
<td> ce_vrs </td>
<td> 5</td>
<td> cr_vrs </td>
<td> 1</td>
</tr><tr><td>
 </td>
<td> ce_fdh </td>
<td> 6</td>
<td> cr_fdh </td>
<td> 1</td>
</tr></table>

ols	1	cols	3
lh	2	qr	4
ce_vrs	5	cr_vrs	1
ce_fdh	6	cr_fdh	1

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

Description

Arguments

Format