A Comparison of the Next Eigenvalue Sufficiency Test to Other Stopping Rules for the Number of Factors in Factor Analysis.

A plethora of techniques exist to determine the number of factors to retain in exploratory factor analysis. A recent and promising technique is the Next Eigenvalue Sufficiency Test (NEST), but has not been systematically compared with well-established stopping rules. The present study proposes a simulation with synthetic factor structures to compare NEST, parallel analysis, sequential test, Hull method, and the empirical Kaiser criterion.

NATURAL HISTORY OF MEDULLARY THYROID CARCINOMA IN MEN-2 PATIENTS CARRYING A VARIANT AT CODON 804 IN THE RET PROTO-ONCOGENE: A STUDY BY THE FRENCH NEUROENDOCRINE TUMOR GROUP (GTE).

Background: RET variants affecting codon 804 are part of the low-to-moderate risk group in the ATA classification, with indications for prophylactic thyroidectomy beyond age of 5 years. However, aggressiveness seems to be variable. The objective of this study was to report a large cohort of French carriers of a pathogenic variant at codon 804 in the RET proto-oncogene.