“Using Different Threshold Value in Comparison Some of Methods Wavelet Estimation for Non Parametric Regression Function with Missing Data” (2021) Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ), 37(1), pp. 1–33. doi:10.55562/jrucs.v37i1.233.