Functional variation of potassium, sodium and chloride ions in selected salttolerant-calli from durum wheat (Triticum durum Des

اختصاصی از اس فایل Functional variation of potassium, sodium and chloride ions in selected salttolerant-calli from durum wheat (Triticum durum Desf.) mature embryo دانلود با لینک مستقیم و پر سرعت .

این مقاله محصول سال 2015 می باشد که در زمینه ی محصول گندم دورم در حوزه ی مهندسی کشاورزی نگاشته شده است و می تواند به عنوان منبعی علمی و پیشینه ای برای دانشجویانی که در زمینه ی گندم دوروم تحقیق دارند مفید باشد.

Near-Wellbore Halo Effect Resulting From Tip-Screenout Fracturing: Direct Measurement and Implication for Sand Control

اختصاصی از اس فایل Near-Wellbore Halo Effect Resulting From Tip-Screenout Fracturing: Direct Measurement and Implication for Sand Control دانلود با لینک مستقیم و پر سرعت .

مقاله SPE شماره 70131

Recovering from Selection Bias in Causal and Statistical Inference مقاله هوش مصنوعی 2014

اختصاصی از اس فایل Recovering from Selection Bias in Causal and Statistical Inference مقاله هوش مصنوعی 2014 دانلود با لینک مستقیم و پر سرعت .

Abstract

Selection bias is caused by preferential exclusion of units from the samples and represents a major obstacle to valid causal and statistical inferences; it cannot be removed by randomized experiments and can rarely be detected in either experimental or observational studies. In this paper, we
provide complete graphical and algorithmic conditions for
recovering conditional probabilities from selection biased
data. We also provide graphical conditions for recoverability
when unbiased data is available over a subset of the variables.
Finally, we provide a graphical condition that generalizes
the backdoor criterion and serves to recover causal effects
when the data is collected under preferential selection.