Histogram With Error Bars
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How To Draw Error Bars By Hand
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Which Quantity Is Used To Generate The Error Bars On A Graph Quizlet
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bars? Say that you were looking at writing scores broken down by race and ses. You might want to graph the mean and confidence interval for each group using a bar chart with error bars as illustrated below. This FAQ shows how
How To Interpret Error Bars
you can make a graph like this, building it up step by step. First, lets get the error bars matlab data file we will be using. use http://www.ats.ucla.edu/stat/stata/notes/hsb2, clear Now, let's use the collapse command to make the mean and standard deviation by race and bar graph with error bars matlab ses. collapse (mean) meanwrite= write (sd) sdwrite=write (count) n=write, by(race ses) Now, let's make the upper and lower values of the confidence interval. generate hiwrite = meanwrite + invttail(n-1,0.025)*(sdwrite / sqrt(n)) generate lowrite = meanwrite - invttail(n-1,0.025)*(sdwrite / sqrt(n)) Now we are https://www.r-bloggers.com/building-barplots-with-error-bars/ ready to make a bar graph of the data The graph bar command makes a pretty good bar graph. graph bar meanwrite, over(race) over(ses) We can make the graph look a bit prettier by adding the asyvars option as shown below. graph bar meanwrite, over(race) over(ses) asyvars But, this graph does not have the error bars in it. Unfortunately, as nice as the graph bar command is, it does not permit error bars. However, we can make a twoway graph that has error bars http://www.ats.ucla.edu/stat/stata/faq/barcap.htm as shown below. Unfortunately, this graph is not as attractive as the graph from graph bar. graph twoway (bar meanwrite race) (rcap hiwrite lowrite race), by(ses) So, we have a conundrum. The graph bar command will make a lovely bar graph, but will not support error bars. The twoway bar command makes lovely error bars, but it does not resemble the nice graph that we liked from the graph bar command. However, we can finesse the twoway bar command to make a graph that resembles the graph bar command and then combine that with error bars. Here is a step by step process.First, we will make a variable sesrace that will be a single variable that contains the ses and race information. Note how sesrace has a gap between the levels of ses (at 5 and 10). generate sesrace = race if ses == 1 replace sesrace = race+5 if ses == 2 replace sesrace = race+10 if ses == 3 sort sesrace list sesrace ses race, sepby(ses) +---------------------------------+ | sesrace ses race | |---------------------------------| 1. | 1 low hispanic | 2. | 2 low asian | 3. | 3 low african-amer | 4. | 4 low white | |---------------------------------| 5. | 6 middle hispanic | 6. | 7 middle asian | 7. | 8 middle african-amer | 8. | 9 middle white | |---------------------------------| 9. | 11 high hispanic | 10. | 12 high asian | 11. | 13 high african-amer | 12. | 14 high white | +--
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