I have just read an article tittled ?Bootstrap Methods for Bias Correction and Confidence Interval Estimation for Nonlinear Quantile Regression of Longitudinal Data?. I want to analyze my data with weight i using PBD for percentile method CIp. I need to calculate confidence Interval 95 and 99 % using this bootstrap method together with their bias. I Will do that with series of data range of 4 values each one. I have installed Matlab R2017a software but I am not able to write the proper syntax. I would like to ask you if you could tell me the correct way to do it.