Analyzing and Interpreting a Mixture of Mixtures Model

bryantw — Fri, 05 Dec 2025 20:56:37 GMT

I created a mixture of mixtures test plan. Now that the data are collected, I'm not sure how to interpret the results. Can I get help to verify that I designed the experiment correctly, and also walk me through how to interpret the results?

I am studying the friction of asphalt surfaces, and specifically the effects of aggregate type, aggregate blend ratios on coarse and fine fractions, and asphalt gradation type.

Aggregate Types, 6 total:
- Class A (high quality): A1, A2, A3
- Class B (low quality): B1, B2, B3

Aggregate Blending (Coarse and Fine portions)
- Blend percent of Coarse Class A and B aggregate in total mix: 0 to 50%
- Blend percent of Fine Class A to B aggregate in total mix: 0 to 50%
- Total of Coarse and Fine = 100%

Gradation Type, 2 types
- Type C
- Type D

Attached is the custom design and results.

Here's the Effect Summary. Some questions: if the blend percentage of Coarse_Class A and Class B are the inverse of eachother, are the effects independent? How do I see effects of just the agg types (A1, A2, A3, vs B1, B2, B3)? I've got more questions, but can't get my bearings straight. THANKS!

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Analyzing and Interpreting a Mixture of Mixtures Model