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Asked: 2026-06-02T01:15:00+00:00

I want to develop a site which can compare two products based on their

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I want to develop a site which can compare two products based on their features.

I want to store features as attributes in database. For example, Cellphone is a product so ‘Screen Type’ and ‘Screen Resolution’ are attributes and their values could be LED/AMOLED and 800×400/340×230.

Database could be of Cellphone/Laptop/TV but database will be for one product type only.

I want to know if there are any algorithms to find out best of two depending on their attributes?

Any suggestion/pointers will be more appreciated.

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1 Answer

  1. Editorial Team

    Here’s a possible algorithm, but it won’t be applicable to multiple users/customers unless they share your same preferences (and disposable income!). I’ve done something roughly like this when looking for an apartment:

    Step 1: For each feature, map the different options to a numerical value. I don’t know much about cell phone screens, but let’s say you consider an AMOLED screen to be worth 20% more than an LED screen. Values that are already numeric can either be mapped discretely or using an equation.

    Step 2: Give each feature a weight.

    Step 3: For each feature, multiply the weight by the value; add these up and you have a score for each product. Whichever product has the highest score wins.

    For example, say each cell phone has these parameters:

    • Screen type: LED or AMOLED
    • Weight in grams
    • Screen dimensions in inches, L*W
    • Screen resolution in pixels, X*Y
    • Battery life in hours

    Mapping each parameter to a value, such that something twice as valuable is twice as high:

    Screen type: LED => 1.0, AMOLED => 1.2
Weight: w => 50/(w+3)
Screen size: (L,W) => sqrt(L^2 + W^2) / 3
Screen DPI: (L,W,X,Y) => sqrt((X*Y)/(L*W)) / 100
Battery life: T => T / 20

    And your relative weights are:

    Screen type: 3
Weight: 1
Screen size: 4
Screen DPI: 2
Battery life: 2

    Compute score for cell phone #1 with an 800x400px, 3×4 inch, LED screen, weighing 40g, with 48 hours of battery life would get a score of:

    3*1.0 + 1*50/(40+3) + 4*sqrt(3^2*4^2)/3 + 2*sqrt(800*400/(3*4))/100 + 2*48/20
= 28.23

    Compute score for cell phone #2 with an 100x100px, 2×1.5 inch, AMOLED screen, weighing 8g, with 200 hours of battery life would get a score of:

    3*1.2 + 1*50/(8+3) + 4*sqrt(2^2*1.5^2)/3 + 2*sqrt(100*100/(2*1.5))/100 + 2*200/20
= 33.3

    So the second phone is “best”. Other parameters, especially cost, should probably be included in the score.

    Accurate results will require accurate mapping to a numerical scale and accurate relative weights – not an easy task, even to decide for yourself. You could allow users to set their own relative weights, perhaps…

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