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Comparing multiple slopes

By maegan | Jan 27, 2018 06:54PM CET

I am having trouble comparing the slopes of multiple lines. I cannot get the slope comparisons to show up in the output tables. There seems to only be a comparison of the y variable means. I select "modeling data" - "linear regression" and fill in my y and x variables then go to the "output/means" tab and select "multiple comparisons/comparison of slopes", then select "pairwise comparison" and "ok".
I have 4 treatment groups and 2 time points so I'm trying to compare the slopes of all 8 lines.

Best Answer
By Sébastien | Jan 30, 2018 11:42AM CET | XLSTAT Agent

Hello,

In order to be able to compare the slopes, you need to include an interaction effect between the qualitative and the quantitative X variables :)
This is an ANCOVA problem.

Let us know if this still does not solve your issue.

Best,

Jean Paul


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By Sébastien | Jan 30, 2018 11:42AM CET | XLSTAT Agent

Hello,

In order to be able to compare the slopes, you need to include an interaction effect between the qualitative and the quantitative X variables :)
This is an ANCOVA problem.

Let us know if this still does not solve your issue.

Best,

Jean Paul

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0
By vasilis | Dec 29, 2018 10:03AM CET

Kendall's tau--> -0.136
S-> -126.000
Var(S)-> 9711.333
p-value (Two-tailed)-> 0.201
alpha-> 0.05

Value Lower bound (95%) Upper bound (95%)
Slope-> -0.020 -0.051 0.002
Intercept 926.587 480.139 1581.397

I have this result. the slope is -0.020 or -126.000 ?

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By Efthalia | Jan 02, 2019 11:15AM CET | XLSTAT Agent

Dear Vasilis,

The Slope coefficient is -0.020.

-126 corresponds to the S statistic used for the test.

Regards,

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