Comparison of treatments in a cataract surgery with circular response.
Circular data are a natural outcome in many biomedical studies, e.g. some measurements in ophthalmologic studies, degrees of rotation of hand or waist, etc. With reference to a real data set on astigmatism induced in two types of cataract surgeries we carry out some two-sample testing problems with the possibility of common or different concentration parameters in the circular set up. Detailed simulation study and the analysis of the data set, including redesigning the cataract surgery data, are carried out.
Applied Statistics Unit, Indian Statistical Institute, Kolkata, India atanu@isical.ac.in.
Atanu
A
Biswas
Department of Statistics, University of Chicago, Illinois, USA.
Somak
S
Dutta
Production and Quantitative Methods, Indian Institute of Management, Ahmedabad, Gujarat, India.
Arnab Kumar
AK
Laha
Cornea and Anterior Segment Unit, L. V. Prasad Eye Institute, Hyderabad, Andhra Pradesh, India.
Partho K
PK
Bakshi
D001251:Astigmatism / Q000209:etiology; D002387:Cataract Extraction / Q000009:adverse effects* / Q000379:methods*; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012399:Rotation
circular data; concentration parameter; von Mises distribution