Variable Selection Essay Example | Topics and Well Written Essays - 250 words

Variable Selection - Essay Example They prefer when the stepwise selection method is used in the algorithm of data analysis programs such as SAS and SPSS. Based on my personal experience I think the author is correct, forward and backward selection produces better results in varied conditions as opposed to stepwise selection. A good selection technique that I have in mind will involve the use of estimation of empirical samples through the use of repeated sampling of data samples. This algorithm allows for the approximation of the distributed test statistics will be usable in small scale data where the large scale results may not hold. This algorithm is efficient because it helps solve the mistake of automated variable selection methods. There are other designed algorithms that are employed under various situations. One that is interesting is the Naà ¯ve Bayes which is based on the Bayes theorem. I think it is not an efficient algorithm because it generalizes samples which easily occurs to errors in analysis of the data

Academic writting Essay Example | Topics and Well Written Essays - 1000 words

Academic writting - Essay Example The challenge is that not everyone might know if they had experienced it. Anxiety can be described as a disorder that causes uneasiness, nervousness, worry and fear. It affects the way an individual feels and behaves towards everyday situation (DiMatteo et al. 2000). Learners often experience anxiety when confronted by a test or examination. Although anxiety is considered as normal, it can also be considered to be a problem when it brings symptoms such as lack of sleep or lack of ability to function normally. Anxiety occurs when a reaction to a situation becomes out of proportion or becomes overbearing for one to think or act normally. As a matter of fact, there are different types of anxiety. These include generalized anxiety disorder, panic disorder anxiety and Social Anxiety Disorder. To begin with, generalized anxiety is a chronic disorder that is excessive, long lasting and tends to affect how the sufferer responds to life events on a daily basis. It causes an individual to worry about nonspecific everyday life situations. A sufferer suffering from this type of disorder would often worry about things that are related to health, money, family and work. The sufferer also finds it difficult in making decisions. The sufferer may not know how to identify the actual fear or know how to deal or control their worry about a nonspecific situation, therefore believing that they will fail in that given situation. It may be possible that the learner may have spent limited study time in the preparation for a test or examination due to work commitments or family responsibilities, this in turn will affect the mindset of the individual making them to believe that they are likely going to perform badly on the test or examination. Also, their mind and body turns a normal emotion as worry that usually motivates one to accomplish a task to a feeling of helplessness that does not allow the learner to get motivated about the exam instead creating panic. As adults, we