(Requires Appendix Material) a Necessary and Sufficient Condition to Derive$\sum _ { i = 1 } ^ { n } \hat { u } _ { i } = 0 \text { and } \sum _ { i = 1 } ^ { n } \hat { u } _ { i } X _ { i } = 0$

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The Answer of (Requires Appendix Material) a Necessary and Sufficient Condition to Derive$\sum _ { i = 1 } ^ { n } \hat { u } _ { i } = 0 \text { and } \sum _ { i = 1 } ^ { n } \hat { u } _ { i } X _ { i } = 0$

(Requires Appendix Material) a Necessary and Sufficient Condition to Derive $\sum _ { i = 1 } ^ { n } \hat { u } _ { i } = 0 \text { and } \sum _ { i = 1 } ^ { n } \hat { u } _ { i } X _ { i } = 0$

Definitions:

(Requires Appendix Material) a Necessary and Sufficient Condition to Derive ∑i=1nu^i=0 and ∑i=1nu^iXi=0\sum _ { i = 1 } ^ { n } \hat { u } _ { i } = 0 \text { and } \sum _ { i = 1 } ^ { n } \hat { u } _ { i } X _ { i } = 0∑i=1n​u^i​=0 and ∑i=1n​u^i​Xi​=0

Definitions:

(Requires Appendix Material) a Necessary and Sufficient Condition to Derive $\sum _ { i = 1 } ^ { n } \hat { u } _ { i } = 0 \text { and } \sum _ { i = 1 } ^ { n } \hat { u } _ { i } X _ { i } = 0$