Samsul  Ariffin Abdul Karim, Mohd  Tahir Ismail, Mahmod  Othman, Mohd  Faris Abdullah, Mohammad  Khatim Hasan, Jumat  Sulaiman, 
    Rational Cubic Spline Interpolation for Missing Solar Data Imputation,
    Journal of Engineering and Applied Sciences,
    Volume 13,Issue 9,
    2018,
    Pages 2587-2592,
    ISSN 1816-949x,
    jeasci.2018.2587.2592,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2018.2587.2592)
    Abstract: Missing data imputation is an important task in statistical and sciences discipline. Solar radiation data
obtained from the solar tracker does not complete and some data are missing due to human error in handling
the instrument or the failure of the instrument. Thus, missing data imputation can be used to predict and
estimate the unknown value of the solar radiation at certain time. This study will estimate the solar radiation by
using rational cubic Ball spline function with three parameters. The interpolating rational Ball spline is able to
give good result based on quadratic regression model.
    Keywords: Missing data;imputation;rational cubic Ball;solar radiation;regression model;quadratic