How to calculate column mean & mean for sub-groups in R or RStudio

This video shows you how to calculate mean for a category inside a given numeric variable. For example, calculating the mean age of women, calculating the mean age of individuals are men and were born in 2000, calculating the mean age of individuals who are women or who were born in 2000, etc.

How to calculate mean for a row or a selection of rows in R:
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How to omit subjects with missing data, remove or ignore NA in calculations in R studio:
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How to replace data values, including missing NAs data values in R or RStudio:
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• #education
• #mean
• #mean_of_a_categoty_of_a_variable
• #r_studio
• #how_to_calculate_mean_in_r
• #how_to_calculate_mean_in_r_studio
• #how_to_calculate_mean_for_a_category_inside_a_variable_in_r
• #how_to_calculate_the_mean_of_a_column_in_r
• #variable
• #average
• #column_average_in_r
• #numeric_variable
• #how_to_calculate_mean_for_a_selected_group_of_individuals_in_the_population_or_sample
• #population_mean
• #sample_mean
• #how_to_calculate_column_mean_mean_for_sub_groups_in_r_or_rstudio