There are many ways data scientists can make error in sampling the population. Using non random samples will usually not give a good presentation of the population. Taking a survey in a specific neighborhood will not result in a good Continue reading Some sources of error in data collection.
Statistics deal with collecting, organizing, analyzing, interpreting, and presenting data. There are two types of statistics: Descriptive and inferential. Descriptive statistics summarizes data from a data set using mean, median, mode, standard deviation…etc. On the other hand, Inferential Statistics makes inferences about populations using Continue reading Which type of Statistical Test should we use?
Tableau and Qlikview have emerged as leading data visualization tools in the last few years. I compared both companies earnings of the last four years from NASDAQ. Qlikview is still number one in revenue but Tableau is gaining a lot of Continue reading Tableau or Qlikview for a fresh career in BI?
Slicers in Excel 2013 are a very important tool that make you filter and see just the fields you want to analyze. Slicers hide all other irrelevant data to the specific analysis. Slicers filter pivot tables. We can filter and Continue reading Slicers in Excel 2013