Spark, Data Science, Tutorial, Machine Learning, Machine Intelligence.
.over(Window.orderBy("year"))).toDF(); data = data.filter(data("rn") > 2).toDF(); data.filter(data("value") !== "C").agg(variance(data("value"))).show(); } Standard Deviation A quantity expressing by how much the members of a group differ from the mean value for the group. this is very useful in