{ "item_title" : "Practical Statistical Power Analysis using WebPower and R", "item_author" : [" Ke-Hai Yuan", "Zhiyong Zhang "], "item_description" : "The importance of conducting a statistical power analysis at the beginning of a study is universally accepted. Without careful planning, a study can easily fail to detect an existing effect by chance. This book teaches how to conduct power analysis for a range of models from correlation and t-test to structural equation models and multilevel models. Both a graphical Web software WebPower and an R package are introduced to practically conduct the analysis.", "item_img_path" : "https://covers2.booksamillion.com/covers/bam/1/94/672/802/1946728020_b.jpg", "price_data" : { "retail_price" : "69.99", "online_price" : "69.99", "our_price" : "69.99", "club_price" : "69.99", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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