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POGantt style time line plot (in base R)
 

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    <p>I have a dataframe that looks like this:</p> <pre><code> person n start end 1 sam 6 0 6 2 greg 5 6 11 3 teacher 4 11 15 4 sam 4 15 19 5 greg 5 19 24 6 sally 5 24 29 7 greg 4 29 33 8 sam 3 33 36 9 sally 5 36 41 10 researcher 6 41 47 11 greg 6 47 53 </code></pre> <p>Where start and end are times or durations (sam spoke from 0 to 6; greg from 6 to 11 etc.). n is how long (in this case # of words) the person spoke. I want to plot this as a time line in base R (I eventually may ask a similar question using ggplot2 but this answer is specific to base R [when I say base I mean the packages that come with a standard install]). </p> <p>The y axis will be by person and the x axis will be time. Hopefully the final product looks something like this for the data above:</p> <p><img src="https://i.stack.imgur.com/sLkRt.jpg" alt="Timeline_Graph"></p> <p>I would like to use base R to make this. I'm not sure how to approach this. My thoughts are to use a dot plot and plot a dotplot but leave out the dots. Then go over this with square end segments. I'm not sure about how this will work since the segments need numeric x and y points to make the segments and the y axis is categorical. Another thought is to convert the factors to numeric (assign each factor a number) and plot as a blank scatterplot and then go over with square end line segments. This could be a powerful tool in my field looking at speech patterns. </p> <p>I thank you in advance for your help.</p> <p><em>PS the argument for square ended line segments is</em> <code>segments(... , lend=2)</code> <em>to save time looking this information up for those not familiar with all the segment arguments.</em></p>
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