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Jan 18, 2018 at 18:20 comment added shadi @whuber, I just edited the question and provided more information.
Jan 18, 2018 at 18:18 history edited shadi CC BY-SA 3.0
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Jan 18, 2018 at 17:33 comment added whuber I don't know whether your regression is "correct": see Nick Cox's answer. I am only pointing out that your question is unclear because it asks how to apply quantile regression, you applied it, and you got a result that is consistent with the data. There's no information to determine whether that is meaningful, appropriate, or correct for your purposes.
Jan 18, 2018 at 17:18 comment added shadi @NickCox, thanks for the reply, I changed the title as you requested. I used power normal transformation and the calculated lambda is -0.37. Based on your advice I used the cube root (please see the final plot above). The nature of observation between 0 to 1 year is different from the rest of the observations. So any advice? I want to make the growth chart at 0.025 and 0.95 quantiles. The data set includes the information of kids from birth to 19 years old. Do you think that I should apply two different quantile regression for 0-1 year old and 1 year to 19 years old?
Jan 18, 2018 at 17:16 comment added shadi @whuber, thanks for the reply. It means you think I use the transformation method in a correct way and also the method for applying the quantile curves is chosen correctly?
Jan 18, 2018 at 16:32 history edited shadi CC BY-SA 3.0
deleted 2 characters in body; edited title
Jan 18, 2018 at 16:27 history edited shadi CC BY-SA 3.0
deleted 2 characters in body; edited title
Jan 18, 2018 at 16:18 comment added Nick Cox You need a better title. It's not informative. Something like "Quantile regression with transformation of response" would work better.
Jan 18, 2018 at 15:51 answer added Nick Cox timeline score: 1
Jan 18, 2018 at 15:45 comment added whuber What is the problem, exactly? Your quantile regression appears to have succeeded.
Jan 18, 2018 at 15:23 history edited shadi CC BY-SA 3.0
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Jan 18, 2018 at 15:04 review First posts
Jan 18, 2018 at 15:12
Jan 18, 2018 at 15:00 history asked shadi CC BY-SA 3.0