User talk:BlackpoliceHK

Your recent edit to Arellano–Bond estimator
Thanks for contributing to the article Arellano–Bond estimator. However, do not use unreliable sources such as blogs, your own website, websites and publications with a poor reputation for checking the facts or with no editorial oversight, expressing views that are widely acknowledged as extremist, that are promotional in nature, or that rely heavily on rumors and personal opinions, as one of Wikipedia's core policies is that contributions must be verifiable through reliable sources, preferably using inline citations. Thanks! P.S. If you need further help, you can look at Help:Contents/Editing Wikipedia, or ask at the Teahouse. Thank you. --bender235 (talk) 18:56, 23 October 2019 (UTC)