I have tweet counts for a bunch of topics by day, by week and by month. Now I want to visualize them using bar charts.
Is it a good practice to visualize the exact counts or shall I take weekly averages and visualize them?
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If you want to analyze the trends over time for a time period greater than a week, then you can average the count per day and analyze. This would help you look at the trends and (possible)seasonality of the tags.
So, as per your problem statement, I would suggest you go with a scatter plot of the tag counts.
You would also like to have a look at this post which talks about keeping an eye on the varying number of days and weekends in monthly cycles.