Gaelim Holland
Author Archives: Gaelim Holland

How to Compare Previous and Current Rows in SQL

One of the easiest ways, to compare this is using the lag function. The lag function will allow you to shift the rows downward so that you can view these rows as one observational row. Here is a simple example of how to use the lag function to shift rows downward. However let’s take a […]

What Makes a Good Data Analyst CV

I thought this might be helpful. I have been working in data. I get a lot of DMs on LinkedIn on what makes a good data analyst CV. I’ve hired about 30 analyst in my career and interviewed a many. Here are the things I think really work and get the attention of HR, CV […]

Get Google Trends Data into Power BI with Python

As of the time of writing this post, there is no native connector in Power BI for Google Trends API to pull data directly a report. However, we can easily do this with just a few lines of Python code. This will allow you to bring in multiple keywords to compare trends over time. We […]

Fill Blank Cell with Previous Cell

Excel has a lot of great functions and shortcuts that will make data cleaning and manipulation easier. Not knowing these techniques will add frustration and a lot of time to your current workload and analysis. You can follow the instructions below to figure out how to fill blank cells with previous cell values. Check out […]

Word Frequency with Python

One of the key steps in NLP or Natural Language Process is the ability to count the frequency of the terms used in a text document or table. To achieve this we must tokenize the words so that they represent individual objects that can be counted. There are a great set of libraries that you […]

Python Data Science Interview Questions and Answers

Honestly, knowing Python and knowing how to answer interview questions with Python can be two separate skills. I have bombed interviews due to not explaining my thought process when approaching a problem. Often interviewers are not concerned that you arrive at a perfect answer in the limited time that you are given. They put more […]

Statistical Tables in Power BI with Python

One of the best things about Python is the sheer number of libraries that can easily be used. You can create correlation tables and statistic summary tables similar to what you find in the data analysis tool kit or in the Pandas library in Python with the native functions. How to create a correlation table:1. […]

Power BI Interview Questions

Here is a list of common Power BI interview questions that are open ended and use to demonstrate the overall knowledge of the applicant. These questions are real and allow you to find intermediate level Power BI practitioners. Answering 6 out of the 10 question would demonstrate a confident familiarity with Power BI.  1. Where […]

Calculate Totals Month to Date & More in Power BI

How to Calcuate MTD, QTD and YTD in Power BI Calculating the month to date, year to date, or quarter to date is not as daunting as you think in DAX. However, there are few stepst that are needed before you can get these function to provide the information that you are looking for.  These […]

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