asjadnaqvi/stata-polarspike

A Stata package for polar spike graphs

Language: Stata - Size: 11.6 MB - Last synced: about 6 hours ago - Pushed: 1 day ago - Stars: 4 - Forks: 0

asjadnaqvi/stata-spider

spider: A Stata package for spider plots.

Language: Stata - Size: 16 MB - Last synced: 1 day ago - Pushed: 1 day ago - Stars: 9 - Forks: 1

FatimaSadik/Econometrics_undergrad

R and Stata codes for Wooldridge and Stock & Watson exercises and examples

Language: R - Size: 5.77 MB - Last synced: 1 day ago - Pushed: 1 day ago - Stars: 0 - Forks: 0

annnvv/mpp-thesis

Language: Stata - Size: 9.65 MB - Last synced: 2 days ago - Pushed: almost 6 years ago - Stars: 0 - Forks: 0

asjadnaqvi/The-Stata-Guide

Files for the Stata Guide on Medium https://medium.com/the-stata-guide

Language: Stata - Size: 344 MB - Last synced: 2 days ago - Pushed: 2 days ago - Stars: 133 - Forks: 47

mhamjediers/sankeyplot

Stata ado-file to create Sankey plots (alluvial plot, stream graph, graph of out-flows)

Language: Stata - Size: 116 KB - Last synced: 2 days ago - Pushed: 3 days ago - Stars: 8 - Forks: 1

asjadnaqvi/stata-circlebar

A Stata package for circular polar bar graphs.

Language: Stata - Size: 27.7 MB - Last synced: 4 days ago - Pushed: 4 days ago - Stars: 6 - Forks: 1

WizardMac/ReadStat

Command-line tool (+ C library) for converting SAS, Stata, and SPSS files 💾

Language: C - Size: 2.13 MB - Last synced: 1 day ago - Pushed: 7 days ago - Stars: 267 - Forks: 68

AugustinCablant/Stage_CREST

Internship at CREST

Language: Jupyter Notebook - Size: 4.55 MB - Last synced: 5 days ago - Pushed: 5 days ago - Stars: 0 - Forks: 0

gesistsa/rio

🐟 A Swiss-Army Knife for Data I/O

Language: R - Size: 2.41 MB - Last synced: about 7 hours ago - Pushed: about 8 hours ago - Stars: 587 - Forks: 77

asjadnaqvi/stata-waffle

A Stata package for Waffle charts

Language: Stata - Size: 2.09 MB - Last synced: 6 days ago - Pushed: 7 days ago - Stars: 3 - Forks: 0

LSYS/stata-utils

Miscellaneous Stata ado utility programs for data analysis work.

Language: Stata - Size: 47.9 KB - Last synced: 7 days ago - Pushed: 7 days ago - Stars: 0 - Forks: 0

tidyverse/haven

Read SPSS, Stata and SAS files from R

Language: C - Size: 7.34 MB - Last synced: about 3 hours ago - Pushed: 6 days ago - Stars: 422 - Forks: 115

LSYS/rbStata

CLI utility to roll back Stata data version.

Language: Python - Size: 2.57 MB - Last synced: 7 days ago - Pushed: about 1 month ago - Stars: 1 - Forks: 0

asjadnaqvi/stata-bimap

A Stata package for bi-variate maps

Language: Stata - Size: 131 MB - Last synced: 9 days ago - Pushed: 9 days ago - Stars: 46 - Forks: 11

asjadnaqvi/stata-joyplot

A Stata package for creating joyplots or ridgeline plots.

Language: Stata - Size: 39.2 MB - Last synced: 9 days ago - Pushed: 9 days ago - Stars: 32 - Forks: 3

JakeC007/dta-to-csv-converter

Inspired by the needs of a law school colleague, this quick script that allows people to convert a Stata data file (`.dta`) to a csv file via R; this assume you don't have stata to open the file instead.

Size: 20.5 KB - Last synced: 10 days ago - Pushed: 10 days ago - Stars: 0 - Forks: 0

iamnarendrasingh/Introduction-of-Stata

Language: Stata - Size: 69.3 KB - Last synced: 10 days ago - Pushed: almost 2 years ago - Stars: 0 - Forks: 0

iamnarendrasingh/India-COVID19-Study

This contains Stata do file as well as dataset.

Language: Stata - Size: 925 MB - Last synced: 10 days ago - Pushed: over 3 years ago - Stars: 0 - Forks: 0

asjadnaqvi/stata-splinefit

A Stata package for smooth line plots

Language: Stata - Size: 1.76 MB - Last synced: 10 days ago - Pushed: 10 days ago - Stars: 4 - Forks: 0

mgao6767/specurve

Stata command to perform specification curve analysis and generate output plots.

Language: Stata - Size: 2.41 MB - Last synced: 11 days ago - Pushed: about 1 month ago - Stars: 13 - Forks: 2

debasmita-das-econ/Stata-Income-Risk-Estimation-NLSY

STATA code for estimating the contribution of motherhood to the size of permanent income shocks using NLSY data (National Longitudinal Survey Data). This was a part of a RA project under Prof. Trevor Gallen (Fall 2019)

Language: Stata - Size: 6.7 MB - Last synced: 10 days ago - Pushed: 11 days ago - Stars: 0 - Forks: 0

asjadnaqvi/stata-streamplot

A Stata package for stream plots

Language: Stata - Size: 17.4 MB - Last synced: 11 days ago - Pushed: 13 days ago - Stars: 12 - Forks: 2

worldbank/datalibweb

datalibweb - datalibweb is the Stata frontend for the microdata API created by Poverty Global Practice in collaboration with ITS and DECDG to enable users to access data and documentation available in different global, regional and country microdata catalogs at the World Bank.

Language: Stata - Size: 10.9 MB - Last synced: 1 day ago - Pushed: 1 day ago - Stars: 3 - Forks: 1

seanpm2001/SNU_2D_ProgrammingTools_IDE_Stata

The Stata programming language IDE submodule for SNU Programming Tools (2D Mode)

Language: Stata - Size: 431 KB - Last synced: 15 days ago - Pushed: over 1 year ago - Stars: 2 - Forks: 1

seanpm2001/Learn-Stata

A repository for showcasing my knowledge of the Stata programming language, and continuing to learn the language.

Language: Stata - Size: 390 KB - Last synced: 15 days ago - Pushed: over 1 year ago - Stars: 2 - Forks: 1

hoangsonww/North-Carolina-Household-Analysis

🏠 This repository contains data analysis scripts for the 2022 American Community Survey (ACS) focusing on individuals aged 25 and over in North Carolina, based on 75,340 observations. This repository offers valuable insights into demographic and economic patterns across North Carolina's urban areas.

Language: R - Size: 9.42 MB - Last synced: 17 days ago - Pushed: 17 days ago - Stars: 6 - Forks: 4

hoangsonww/Global-COVID19-Analysis

🌍 This repository hosts an in-depth analysis of COVID-19's impact across five key countries from Jan 2020 to Dec 2021. Through advanced data analysis and visualization, we aim to provide insights into how the pandemic evolved differently across these nations, shedding light on the effectiveness of various health measures and vaccination campaigns.

Language: R - Size: 3.91 MB - Last synced: 17 days ago - Pushed: 17 days ago - Stars: 5 - Forks: 4

VNyaga/Metapreg

Evidence synthesis of proportions

Language: Stata - Size: 1.05 MB - Last synced: 17 days ago - Pushed: 18 days ago - Stars: 0 - Forks: 0

sikaiser/oesch

Stata module to recode ISCO codes into Oesch class scheme

Language: Stata - Size: 44.9 KB - Last synced: 18 days ago - Pushed: about 5 years ago - Stars: 0 - Forks: 0

larmarange/labelled

Manipulating labelled vectors in R

Language: R - Size: 30.2 MB - Last synced: 18 days ago - Pushed: 19 days ago - Stars: 70 - Forks: 15

andreped/tumor-growth

🧠 Growth dynamics of untreated meningiomas

Language: Python - Size: 3.46 MB - Last synced: 20 days ago - Pushed: 20 days ago - Stars: 3 - Forks: 0

geoffreycastillo/continuous-ios-data-code

Data and code for the paper 'Continuous Inclusion of Other in the Self'

Language: Stata - Size: 880 KB - Last synced: 20 days ago - Pushed: 20 days ago - Stars: 0 - Forks: 0

asjadnaqvi/stata-treemap

A Stata package for tree maps

Language: Stata - Size: 14.8 MB - Last synced: 22 days ago - Pushed: 22 days ago - Stars: 11 - Forks: 3

UCL/metafloat

Estimation of covariate interactions and subgroup-specific treatment effects in meta-analysis.

Language: Stata - Size: 282 KB - Last synced: 23 days ago - Pushed: 24 days ago - Stars: 0 - Forks: 0

wbuchanan/stataConference2023

Slide deck for: Metaprogramming: What it is, how to use it, and why you should care

Language: JavaScript - Size: 2.28 MB - Last synced: 26 days ago - Pushed: 10 months ago - Stars: 0 - Forks: 1

wbuchanan/stataConference2020-readit

Slides for 2020 Stata Conference talk about the program readit

Language: JavaScript - Size: 1.63 MB - Last synced: 26 days ago - Pushed: almost 4 years ago - Stars: 0 - Forks: 0

wbuchanan/stataConference2021

Beyond n-grams, tf-idf, and word indicators for text: Leveraging the Python API for vector embeddings

Language: Jupyter Notebook - Size: 3.76 MB - Last synced: 26 days ago - Pushed: almost 3 years ago - Stars: 0 - Forks: 1

wbuchanan/crossvalidate

Stata package to implement cross-validation methods for statistical models

Language: Stata - Size: 643 KB - Last synced: 26 days ago - Pushed: about 2 months ago - Stars: 2 - Forks: 0

noah-andersen/econometric-territorial-disputes-on-trade

The aim of this work is to find the causal effect of territorial disputes on bilateral trade, specifically for the PRC and its bordering neighbors. We apply different Econometric frameworks and methods to find this underlying effect.

Size: 1.95 KB - Last synced: 26 days ago - Pushed: 26 days ago - Stars: 0 - Forks: 0

razvanazamfirei/utilities

Stata Utilities

Language: Stata - Size: 903 KB - Last synced: 26 days ago - Pushed: 6 months ago - Stars: 1 - Forks: 0

andrewheiss/SublimeStataEnhanced

Plugin that adds support for Stata 11–15 for Sublime Text 2 and 3

Language: Python - Size: 68.4 KB - Last synced: 27 days ago - Pushed: over 4 years ago - Stars: 56 - Forks: 22

Lefteris-Souflas/Economic-Connectedness-Analysis

Jupyter notebook, replicating studies on social capital from Nature journal, analyze economic connectedness, upward income mobility, and more. Python and relevant datasets are utilized to recreate figures and analyses.

Language: HTML - Size: 20.1 MB - Last synced: 27 days ago - Pushed: 27 days ago - Stars: 0 - Forks: 0

mcaceresb/stata-gtools

Faster implementation of Stata's collapse, reshape, xtile, egen, isid, and more using C plugins

Language: Stata - Size: 38.9 MB - Last synced: 6 months ago - Pushed: 6 months ago - Stars: 167 - Forks: 35

junyuan-chen/ReadStatTables.jl

Read and write Stata, SAS and SPSS data files with Julia tables

Language: Julia - Size: 721 KB - Last synced: 9 days ago - Pushed: about 1 month ago - Stars: 34 - Forks: 5

AlessiaPulvirenti/Micrometrics_PS

Repository for problem set works of Microeconometrics graduate course at Bocconi University. Used to keep track of the changes to the dofiles of the group members

Language: Stata - Size: 35.5 MB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 0 - Forks: 0

amichuda/randcoef

A repository that holds the source code for the `randcoef` command in Stata

Language: Stata - Size: 143 KB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 0 - Forks: 0

worldbank/ietoolkit

Stata commands designed for Impact Evaluations in particular, but also data work in general

Language: Stata - Size: 1.97 MB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 207 - Forks: 73

josherrickson/kublakhan 📦

A collection of personal Stata ado files

Language: Stata - Size: 31.3 KB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 0 - Forks: 0

btskinner/stata_unit_test

Unit testing user-written commands in Stata

Language: Stata - Size: 9.77 KB - Last synced: about 1 month ago - Pushed: almost 5 years ago - Stars: 7 - Forks: 0

btskinner/lpo9951

Course files for LPO 9951: PhD Student Research Practicum

Language: HTML - Size: 13.3 MB - Last synced: about 1 month ago - Pushed: over 4 years ago - Stars: 0 - Forks: 2

btskinner/rmargins

Stata-like margins in R by hand

Language: R - Size: 31.3 KB - Last synced: about 1 month ago - Pushed: over 4 years ago - Stars: 0 - Forks: 0

kylebarron/stata_kernel

A Jupyter kernel for Stata. Works with Windows, macOS, and Linux.

Language: Python - Size: 19.6 MB - Last synced: 23 days ago - Pushed: about 1 month ago - Stars: 257 - Forks: 54

Anindyakafka/STATA-Project

STATA Project

Language: Stata - Size: 14.6 KB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 0 - Forks: 0

najmabad/microeconometrics_assignments

microeconometrics assignments in Stata

Size: 104 KB - Last synced: about 1 month ago - Pushed: almost 6 years ago - Stars: 0 - Forks: 0

labordynamicsinstitute/continuous-integration-stata Fork of ledwindra/continuous-integration-stata

Github Action to run Stata in the Cloud

Language: Shell - Size: 250 KB - Last synced: about 1 month ago - Pushed: over 2 years ago - Stars: 1 - Forks: 0

econcz/stata-arimaauto

'ARIMAAUTO': module to find the best ARIMA model with the help of a Stata-adjusted Hyndman-Khandakar (2008) algorithm

Language: Stata - Size: 88.9 KB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 2 - Forks: 0

Yuttttian/does_having_siblings_reduce_an_individual-s_access_to_educational_resources-

the empirical analysis focused on resource dilution theory, access to education, and gender discrimination. innovated to consider parental education participation from CEPS. Stata

Language: Rich Text Format - Size: 6.5 MB - Last synced: about 1 month ago - Pushed: about 2 years ago - Stars: 2 - Forks: 0

tommymorg/stata_sendtoslack

code to send yourself a message on Slack when Stata do-files run or fail

Language: Stata - Size: 14.6 KB - Last synced: about 1 month ago - Pushed: almost 2 years ago - Stars: 0 - Forks: 0

elynch21/Public-Health-490KR-Epidemiologic-Data-Management-and-Analysis

Undergraduate Course Work from Public Health 490KR Epidemiologic Data Management & Analysis, Taught by Professor Katherine W. Reeves, PhD, MPH

Language: Stata - Size: 7.86 MB - Last synced: about 2 months ago - Pushed: about 2 years ago - Stars: 0 - Forks: 0

nicholaspoggioli/code-fixed-effects-regression

Generate longitudinal data and demonstrate the bias caused by failed fixed effects assumptions.

Language: Stata - Size: 645 KB - Last synced: about 2 months ago - Pushed: about 3 years ago - Stars: 0 - Forks: 1

ddotta/parquetize

R package that allows to convert databases of different formats to parquet format

Language: R - Size: 6.86 MB - Last synced: 7 days ago - Pushed: 2 months ago - Stars: 56 - Forks: 4

hugetim/nbstata

A Jupyter kernel for Stata built on pystata

Language: Jupyter Notebook - Size: 9.2 MB - Last synced: 26 days ago - Pushed: 5 months ago - Stars: 21 - Forks: 1

dzhw/variableMetadataPreparation

This tool extracts metadata of variables and creates JSON files for the mdm.

Language: R - Size: 329 MB - Last synced: about 2 months ago - Pushed: over 2 years ago - Stars: 0 - Forks: 1

nuitrcs/examplejobs

Example job submission and application scripts for Northwestern's Quest computing cluster

Language: Shell - Size: 21.2 MB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 31 - Forks: 13

vikjam/mostly-harmless-replication

Replication of tables and figures from "Mostly Harmless Econometrics" in Stata, R, Python and Julia.

Language: Stata - Size: 4.08 MB - Last synced: about 2 months ago - Pushed: over 1 year ago - Stars: 560 - Forks: 305

IQSS/dss-workshops

Data science workshop materials developed by Data Science Services (IQSS) and Research Computing Services (HBS).

Language: PostScript - Size: 1.5 GB - Last synced: 27 days ago - Pushed: over 3 years ago - Stars: 15 - Forks: 14

IQSS/dss-workshops-archived

IQSS Data Science Services workshop materials

Language: HTML - Size: 696 MB - Last synced: 27 days ago - Pushed: about 5 years ago - Stars: 78 - Forks: 187

Okelucas/Bachelor-Thesis-with-Stata-

Language: Stata - Size: 1.23 MB - Last synced: about 2 months ago - Pushed: over 1 year ago - Stars: 0 - Forks: 0

remlapmot/reffadjust

Stata commands for random effects adjustment

Language: Stata - Size: 412 KB - Last synced: about 2 months ago - Pushed: about 2 months ago - Stars: 0 - Forks: 1

RedDoorAnalytics/multistate

multistate provides a general framework for flexible parametric modelling of arbitrary multi-state survival models in Stata

Language: Stata - Size: 2.3 MB - Last synced: about 2 months ago - Pushed: about 2 months ago - Stars: 2 - Forks: 2

rominagoodarzi/Applied_Econometrics_Workshop_Project

Any questions, comments, or feedbacks are welcomed! You may contact me by sending an email to [email protected]

Language: Stata - Size: 28.3 KB - Last synced: about 2 months ago - Pushed: about 2 months ago - Stars: 1 - Forks: 0

rominagoodarzi/Stata_Pr2_data_analysis

Language: Stata - Size: 266 KB - Last synced: about 2 months ago - Pushed: about 2 months ago - Stars: 0 - Forks: 0

remlapmot/confunnel-stata

Stata command implementing contour enhanced funnel plots for meta-analysis

Language: Stata - Size: 510 KB - Last synced: 2 months ago - Pushed: 2 months ago - Stars: 1 - Forks: 0

sjewo/readstata13

Package to read the Stata 13 (and newer) file format into a R data.frame

Language: R - Size: 929 KB - Last synced: 26 days ago - Pushed: 8 months ago - Stars: 42 - Forks: 9

benzipperer/historicalminwage

This repository contains the raw data, code, and sources used to create state and sub-state historical minimum wage datasets originally described in Vaghul and Zipperer (2016).

Language: Stata - Size: 768 KB - Last synced: about 2 months ago - Pushed: over 1 year ago - Stars: 13 - Forks: 8

bquistorff/synth_runner

A tool to run a pool of synthetic controls, conduct inference, and produce visualizations.

Language: Stata - Size: 7.15 MB - Last synced: about 2 months ago - Pushed: over 2 years ago - Stars: 42 - Forks: 27

TiesdeKok/ipystata

Enables the use of Stata together with Python via Jupyter (IPython) notebooks.

Language: Jupyter Notebook - Size: 14.3 MB - Last synced: 25 days ago - Pushed: 8 months ago - Stars: 188 - Forks: 66

petbrueck/sursol

Stata commands designed for working with the Survey Solutions platform for data collection

Language: Stata - Size: 318 KB - Last synced: 2 months ago - Pushed: 2 months ago - Stars: 1 - Forks: 2

nppackages/scpi

Prediction and inference procedures for synthetic control methods with multiple treated units and staggered adoption.

Language: R - Size: 10.2 MB - Last synced: 9 days ago - Pushed: 5 months ago - Stars: 27 - Forks: 9

dmsul/econtools

Econometrics and data manipulation functions.

Language: Python - Size: 3.01 MB - Last synced: 8 days ago - Pushed: over 2 years ago - Stars: 106 - Forks: 25

bquistorff/stata_reproducible

Tools to make output from Stata reproducible (byte-identical)

Language: Stata - Size: 410 KB - Last synced: about 2 months ago - Pushed: almost 3 years ago - Stars: 14 - Forks: 4

jpazvd/wbopendata

WBOPENDATA: Stata module to access World Bank databases

Language: Stata - Size: 43.1 MB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 31 - Forks: 14

gvegayon/parallel

PARALLEL: Stata module for parallel computing

Language: Stata - Size: 7.68 MB - Last synced: about 2 months ago - Pushed: 7 months ago - Stars: 110 - Forks: 26

andyphilips/dynamac

Dynamic simulation and testing for single-equation ARDL models, available for both R and Stata

Language: R - Size: 4.28 MB - Last synced: 22 days ago - Pushed: over 3 years ago - Stars: 7 - Forks: 6

BridgetWaineina/discontinuation

Discontinuation of contraceptives

Size: 3.91 KB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 0 - Forks: 0

GPID-WB/pcn

Stata package to manage povcalnet (PCN) files and folder strcuture

Language: Stata - Size: 21 MB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 0 - Forks: 1

socimh/statart

Stata-inspired functionality alongside tidyverse-style operations

Language: R - Size: 4.22 MB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 0 - Forks: 0

wbuchanan/ipeds

Stata interface to IPEDS data sets

Language: Stata - Size: 5.97 MB - Last synced: 26 days ago - Pushed: over 6 years ago - Stars: 5 - Forks: 0

zadrafi/concurve

A repository for the 'concurve' R package which generates confidence distributions and likelihood functions. Includes documentation on how to do produce similar graphs for Stata.

Language: TeX - Size: 72.5 MB - Last synced: 11 days ago - Pushed: 4 months ago - Stars: 20 - Forks: 3

thornoe/energy

Paper on estimating hourly demand side responses to intermittent electricity prices for the seminar course Energy Economics at UCPH

Language: TeX - Size: 54.8 MB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 0 - Forks: 0

econcz/stata-xtrevu

'XTREVU': module to reverse the order of values of time series and panel data variables

Language: Stata - Size: 4.88 KB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 1 - Forks: 0

econcz/stata-tmpinvi

'TMPINVI': module providing an iterated (multistep) Transaction Matrix (TM)-specific implementation of the LPLS estimator'TMPINVI': module providing an iterated (multistep) Transaction Matrix (TM)-specific implementation of the LPLS estimator

Language: Stata - Size: 8.79 KB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 1 - Forks: 0

econcz/stata-tmpinv

'TMPINV': module to providing a non-iterated Transaction Matrix (TM)-specific implementation of the LPLS estimator

Language: Stata - Size: 280 KB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 1 - Forks: 0

mwsohn/Stella.jl

Julia functions that mimics stata functionality

Language: Julia - Size: 628 KB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 2 - Forks: 1

ttalVlatt/ipeDTAs Fork of btskinner/downloadipeds

Automagically download labeled .dta versions of IPEDS data files for analysis in Stata or R (via haven)

Language: Stata - Size: 248 KB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 0 - Forks: 0

haghish/rcall

Seamless interactive R in Stata. rcall allows communicating data sets, matrices, variables, and scalars between Stata and R conveniently

Language: Stata - Size: 1.71 MB - Last synced: about 2 months ago - Pushed: 8 months ago - Stars: 88 - Forks: 29

jmboehm/Douglass.jl

Stata-like toolkit for data wrangling on Julia DataFrames

Language: Julia - Size: 240 KB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 47 - Forks: 3

kasselhingee/sqreg-diagnostic-plots

Scripts to create diagnostic plots of stata sqreg fitr

Language: Stata - Size: 59.6 KB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 0 - Forks: 0

Global-Policy-Lab/gpl-covid

Repo for code and small datasets related to Global Policy Lab's COVID-19 policy analysis. Read and share the acompanying article here:

Language: Jupyter Notebook - Size: 381 MB - Last synced: 3 months ago - Pushed: almost 3 years ago - Stars: 14 - Forks: 13