Honduras - Transportation and Farm to Market Roads

The target population for the household survey was the population of all households in Honduras at the beginning and end of the project. We used a sample frame constructed for the most recent National Census. Because that Census was conducted a number of years ago (2001), the survey field procedures included procedures to ensure that all current households are subject to sampling (e.g., use of systematic sampling over all of the current households of the entire census segment).
Please see Annex 3 of Final Evaluation Report for details. NORC used a panel survey with a stratified two-stage sample design in which the first-stage sample units are caserios. Caserios were selected for use as the first-stage sample unit not only because they (like Census segments) are an efficient size for sampling, but also because a substantial amount of GIS data is available for them.

The sample frame was a list of 22,816 caserios stored in the GIS (and the same as those available from the Census). Caserios in the Islas de la Bahia and Gracias a Dios departments, and caserios in protected status, were excluded as out of scope, reducing the sample frame size to 20,467. These are the primary sampling units (PSUs) for the study.

The caserio sample size and the number of households to be selected from each sample caserio were determined by a detailed statistical power analysis. Based on this analysis, NORC decided to select a sample of 20 households from each of 100 sample caserios. That is, the sample design called for a sample of 2,000 households located in 100 caserios, in each of two survey rounds (before and after the program intervention). The same households were to be interviewed in both survey rounds. Because some caserios did not contain 20 households, baseline data were collected on a total of 1,600 households.


There were no deviations from the sample design.


Of the targeted households, 1,408 households, or about 88 percent, yielded completed interviews in the second round of data collection.


Probabilities of selection of caserios (the PSU) are contained in the file named SampleWith SelectionProbabilities.xls. "Base weights" would be calculated as the reciprocal of the variable "Prob," normalized.

Standard errors are calculated for all estimates. They are presented in the Final Report for all estimates. The standard errors were estimated using Stata procedures. They are also presented in the Stata .log file that accompanied the project documentation.