Creating user defined functions (UDFs) is a powerful method to improve the quality of computer applications, in particular spreadsheets. However, the only direct way to use UDFs in spreadsheets is to switch from the functional and declarative style of spreadsheet formulas to the imperative VBA, which creates a high entry barrier even for proficient spreadsheet users. It has been proposed to ext...

The weibull distribution is mostly used in reliability analysis life data due to its versatility. Depending on the values of parameters, can be model a variety behaviors. three parameter estimate probability null wind speed and gives greater weight low speeds. We also discuss least square method estimation problems hypothesis testing issues, with emphasis graphical methods some software are pro...