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Calcimator

Weighting Calculator

Calculate post-stratification weights to adjust your survey sample to match population proportions. See the weight for each stratum and overall weighting efficiency.

Inputs

%
%
%
%
%
%
%
%

Results

Stratum 1 Weight

1.28

Stratum 2 Weight1.4
Stratum 3 Weight0
Stratum 4 Weight0
Maximum Weight1.4
Weighting Efficiency99.78%
Sample Pcts40, 35
Min Weight1.28
How to Use This Calculator
  1. Enter the unweighted sample proportions for each demographic stratum.
  2. Input the population proportions for the same strata from census or administrative data.
  3. Review the Post-Stratification Weights calculated for each group.
  4. Apply the weights to your survey responses in your analysis software.
  5. Check the Design Effect output to understand how weighting increases effective variance.

How the result changes with Sample % Stratum 1

Sample % Stratum 1Stratum 1 Weight
105.1
351.46
650.78
900.57

What each input means

Sample % Stratum 1
Percentage of your survey sample that falls in stratum 1 (e.g., females). This is what you observed.
Population % Stratum 1
Known population percentage for stratum 1 from census or other reference data.
Sample % Stratum 2
Percentage of your survey sample in stratum 2 (e.g., males).
Population % Stratum 2
Known population percentage for stratum 2.
Sample % Stratum 3
Percentage of your survey sample in stratum 3. Set to 0 if unused.
Population % Stratum 3
Known population percentage for stratum 3. Set to 0 if unused.
Sample % Stratum 4
Percentage of your survey sample in stratum 4. Set to 0 if unused.
Population % Stratum 4
Known population percentage for stratum 4. Set to 0 if unused.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Sample % Stratum 1 = 40, Population % Stratum 1 = 51, Sample % Stratum 2 = 35, Population % Stratum 2 = 49 = 8 input(s) provided
  2. Calculate Stratum 1 Weight
    Stratum 1 Weight
    1.275 = 1.275
  3. Calculate Stratum 2 Weight
    Stratum 2 Weight
    1.4 = 1.4
  4. Calculate Stratum 3 Weight
    Stratum 3 Weight
    0 = 0

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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